file formats+howto
Add the following to any normal cardname:
- .txt — MIME type: text/plain, layout=none, view=naked
- .css — MIME type: text/css, layout=none, view=naked
- .htm or .html — same as with no file ending (MIME type: text/html)
- .rss — returns a feeds (MIME type: application/rss+xml).