Added pages from funkwhale.audio (coc and statuts)

@Sporiff so we now have the coc and collective pages from funkwhale.audio replicated on the website.

To avoid ajax calls at runtime, I've taken a simpler approach: during the build, we simply copy the markdown pages from funkwhale.audio to the src/pages directory. This means we can have the exact same code on both sites to handle static markdown pages ;)

Feel free to merge if it's ok for you.