docs: add embed images section to README.md

Explain the purpose of the ./static/embed/ directory and recommended image dimensions for social media embeds

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README.md
··· 32 32 - `PUBLIC_LASTFM_USERNAME`: Required for the Now Playing (Last.fm) feature in `src/lib/components/profile/Status.svelte`. 33 33 - `PUBLIC_ACTIVITYPUB_USER=@user@server.tld`: Enables ActivityPub compatibility for improved content sharing and discoverability. 34 34 35 + #### Embed Images 36 + 37 + While the `./static/embed/` directory is currently empty, it is intended for social media embed images. By default, the system will look for `blog.png` or `main.png` within this directory. For optimal display, these images should have dimensions of 630x1200 pixels. 38 + 35 39 ## Usage 36 40 37 41 ### Development