docs: add BotStopper docs from the git repo (#752)

Signed-off-by: Xe Iaso <[e-mail]>

.github/actions/spelling/expect.txt

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docs/docs/admin/botstopper.mdx

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+---
+title: "Commercial support and an unbranded version"
+---
+
+If you want to use Anubis but organizational policies prevent you from using the branding that the open source project ships, we offer a commercial version of Anubis named BotStopper. BotStopper builds off of the open source core of Anubis and offers organizations more control over the branding, including but not limited to:
+
+- Custom images for different states of the challenge process (in process, success, failure)
+- Custom CSS and fonts
+- Custom titles for the challenge and error pages
+- "Anubis" replaced with "BotStopper" across the UI
+- A private bug tracker for issues
+
+In the near future this will expand to:
+
+- A private challenge implementation that does advanced fingerprinting to check if the client is a genuine browser or not
+- Advanced fingerprinting via [Thoth-based advanced checks](./thoth.mdx)
+
+In order to sign up for BotStopper, please do one of the following:
+
+- Sign up [on GitHub Sponsors](https://github.com/sponsors/Xe) at the $50 per month tier or higher
+- Email [[e-mail]](mailto:[e-mail]) with your requirements for invoicing, please note that custom invoicing will cost more than using GitHub Sponsors for understandable overhead reasons
+
+## Installation
+
+Install BotStopper like you would Anubis, but replace the image reference. EG:
+
+```diff
+-ghcr.io/techarohq/anubis:latest
++ghcr.io/techarohq/botstopper/anubis:latest
+```
+
+### Binary packages
+
+Binary packages are available [in the GitHub Releases page](https://github.com/TecharoHQ/botstopper/releases), the main difference is that the package name is `techaro-botstopper`, the systemd service is `[e-mail]`, the binary is `/usr/bin/botstopper`, and the configuration is in `/etc/techaro-botstopper`. All other instructions in the [native package install guide](./native-install.mdx) apply.
+
+### Docker / Podman
+
+In order to pull the BotStopper image, you need to [authenticate with GitHub's Container Registry](https://docs.github.com/en/packages/working-with-a-github-packages-registry/working-with-the-container-registry#authenticating-to-the-container-registry).
+
+```text
+docker login ghcr.io -u your-username --password-stdin
+```
+
+Then you can use the image as normal.
+
+### Kubernetes
+
+If you are using Kubernetes, you will need to create an image pull secret:
+
+```text
+kubectl create secret docker-registry \
+  techarohq-botstopper \
+  --docker-server ghcr.io \
+  --docker-username your-username \
+  --docker-password your-access-token \
+  --docker-email [e-mail]
+```
+
+Then attach it to your Deployment:
+
+```diff
+     spec:
+       securityContext:
+         fsGroup: 1000
++      imagePullSecrets:
++      - name: techarohq-botstopper
+```
+
+## Configuration
+
+### Docker compose
+
+Follow [the upstream Docker compose directions](https://anubis.techaro.lol/docs/admin/environments/docker-compose) with the following additional options:
+
+```diff
+   anubis:
+     image: ghcr.io/techarohq/botstopper/anubis:latest
+     environment:
+       BIND: ":8080"
+       DIFFICULTY: "4"
+       METRICS_BIND: ":9090"
+       SERVE_ROBOTS_TXT: "true"
+       TARGET: "http://nginx"
+       OG_PASSTHROUGH: "true"
+       OG_EXPIRY_TIME: "24h"
+
++      # botstopper config here
++      CHALLENGE_TITLE: "Doing math for your connnection!"
++      ERROR_TITLE: "Something went wrong!"
++      OVERLAY_FOLDER: /assets
++    volumes:
++      - "./your_folder:/assets"
+```
+
+#### Example
+
+There is an example in [docker-compose.yaml](https://github.com/TecharoHQ/botstopper/blob/main/docker-compose.yaml). Start the example with `docker compose up`:
+
+```text
+docker compose up -d
+```
+
+And then open [https://botstopper.local.cetacean.club:8443](https://botstopper.local.cetacean.club:8443) in your browser.
+
+> [!NOTE]  
+> This uses locally signed sacrificial TLS certificates stored in `./demo/pki`. Your browser will rightly reject these. Here is what the example looks like:
+>
+> ![](/img/botstopper/example-screenshot.webp)
+
+## Custom images and CSS
+
+Anubis uses an internal filesystem that contains CSS, JavaScript, and images. The BotStopper variant of Anubis lets you specify an overlay folder with the environment variable `OVERLAY_FOLDER`. The contents of this folder will be overlaid on top of Anubis' internal filesystem, allowing you to easily customize the images and CSS.
+
+Your directory tree should look like this, assuming your data is in `./your_folder`:
+
+```text
+./your_folder
+└── static
+    ├── css
+    │   └── custom.css
+    └── img
+        ├── happy.webp
+        ├── pensive.webp
+        └── reject.webp
+```
+
+For an example directory tree using some off-the-shelf images the Tango icon set, see the [testdata](https://github.com/TecharoHQ/botstopper/tree/main/testdata/static/img) folder.
+
+### Custom CSS
+
+CSS customization is done mainly with CSS variables. View [the example custom CSS file](https://github.com/TecharoHQ/botstopper/blob/main/testdata/static/css/custom.css) for more information about what can be customized.
+
+### Custom fonts
+
+If you want to add custom fonts, copy the `woff2` files alongside your `custom.css` file and then include them with the [`@font-face` CSS at-rule](https://developer.mozilla.org/en-US/docs/Web/CSS/@font-face):
+
+```css
+@font-face {
+  font-family: "Oswald";
+  font-style: normal;
+  font-weight: 200 900;
+  font-display: swap;
+  src: url("./fonts/oswald.woff2") format("woff2");
+}
+```
+
+Then adjust your CSS variables accordingly:
+
+```css
+:root {
+  --body-sans-font: Oswald, sans-serif;
+  --body-preformatted-font: monospace;
+  --body-title-font: serif;
+}
+```
+
+To convert `.ttf` fonts to [Web-optimized woff2 fonts](https://www.w3.org/TR/WOFF2/), use the `woff2_compress` command from the `woff2` or `woff2-tools` package:
+
+```console
+$ woff2_compress oswald.ttf
+Processing oswald.ttf => oswald.woff2
+Compressed 159517 to 70469.
+```
+
+Then you can import and use it as normal.
+
+### Customizing images
+
+Anubis uses three images to visually communicate the state of the program. These are:
+
+| Image name     | Intended message                                 | Example                           |
+| :------------- | :----------------------------------------------- | :-------------------------------- |
+| `happy.webp`   | You have passed validation, all is good          | ![](/img/botstopper/happy.webp)   |
+| `pensive.webp` | Checking is running, hold steady until it's done | ![](/img/botstopper/pensive.webp) |
+| `reject.webp`  | Something went wrong, this is a terminal state   | ![](/img/botstopper/reject.webp)  |
+
+To make your own images at the optimal quality, use the following ffmpeg command:
+
+```text
+ffmpeg -i /path/to/image -vf scale=-1:384 happy.webp
+```
+
+`ffprobe` should report something like this on the generated images:
+
+```text
+Input #0, webp_pipe, from 'happy.webp':
+  Duration: N/A, bitrate: N/A
+  Stream #0:0: Video: webp, none, 25 fps, 25 tbr, 25 tbn
+```
+
+In testing 384 by 384 pixels gives the best balance between filesize, quality, and clarity.
+
+```text
+$ du -hs *
+4.0K    happy.webp
+ 12K    pensive.webp
+8.0K    reject.webp
+```
+
+## Customizing messages
+
+You can customize messages using the following environment variables:
+
+| Message              | Environment variable | Default                                    |
+| :------------------- | :------------------- | :----------------------------------------- |
+| Challenge page title | `CHALLENGE_TITLE`    | `Ensuring the security of your connection` |
+| Error page title     | `ERROR_TITLE`        | `Error`                                    |
+
+For example:
+
+```sh
+# /etc/techaro-botstopper/gitea.env
+CHALLENGE_TITLE="Wait a moment please!"
+ERROR_TITLE="Client error"
+```