add prettier configuration

This also removes the Zed Prettier configuration, because AFAICT, it
never actually worked, and will not work with how we install Prettier
now. :(

Signed-off-by: Winter <[e-mail]>

.prettierignore

···
+flake.lock
+
+# for now, we don't want these formatted, but let's consider it in the future?
+*.json
+*.md
+*.yml
+*.yaml
+*.jsonc
+*.json
+
+# causes Go template plugin errors: https://github.com/NiklasPor/prettier-plugin-go-template/issues/120
+appview/pages/templates/layouts/repobase.html
+appview/pages/templates/repo/tags.html

.prettierrc.json

···
+{
+  "overrides": [
+    {
+      "files": ["*.html"],
+      "options": {
+        "parser": "go-template"
+      }
+    }
+  ],
+  "bracketSameLine": true,
+  "htmlWhitespaceSensitivity": "ignore"
+}

.zed/settings.json

···
-// Folder-specific settings
-//
-// For a full list of overridable settings, and general information on folder-specific settings,
-// see the documentation: https://zed.dev/docs/configuring-zed#settings-files
-{
-  "languages": {
-    "HTML": {
-      "prettier": {
-        "format_on_save": false,
-        "allowed": true,
-        "parser": "go-template",
-        "plugins": ["prettier-plugin-go-template"]
-      }
-    }
-  }
-}

flake.nix

···
       pkgsCross-gnu64-pkgsStatic-knot = crossPackages.knot;
       pkgsCross-gnu64-pkgsStatic-knot-unwrapped = crossPackages.knot-unwrapped;
       pkgsCross-gnu64-pkgsStatic-spindle = crossPackages.spindle;
+
+      prettier-wrapper = pkgs.runCommandLocal "prettier-wrapper" {nativeBuildInputs = [pkgs.makeWrapper];} ''
+        mkdir -p "$out/bin"
+        makeWrapper ${pkgs.prettier}/bin/prettier "$out/bin/prettier" --add-flags "--plugin=${pkgs.prettier-plugin-go-template}/lib/node_modules/prettier-plugin-go-template/lib/index.js"
+      '';
     });
     defaultPackage = forAllSystems (system: self.packages.${system}.appview);
     formatter = forAllSystems (system: nixpkgsFor.${system}.alejandra);
···
           pkgs.redis
           pkgs.coreutils # for those of us who are on systems that use busybox (alpine)
           packages'.lexgen
+          packages'.prettier-wrapper
         ];
         shellHook = ''
           mkdir -p appview/pages/static