remove implementation.md

implementation.md

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-# Implementation Guide
-
-ActivityPub's spec isn't specific in certain areas, so this document describes common usage.
-
-## Rendering Markup
-
-`text/plain` is easy to render. Potentially you can go through and try to identify links to make them easily selectable.
-
-`text/gemini` is not used by anyone but easy to render and nice for Twitter-style content.
-
-`text/html`: I will support:
-
-From section 4.8: img, audio, video, iframe for image/*, audio/\*, video/\*, and text/html.
-From section 4.6: a
-From section 4.5: most of the elements
-From section 4.4: most of the elements
-From section 4.3: h1, h2, etc.