Resolve "Broken links" NOCHANGELOG

Closes #2189 (closed)

[./api/Readme.md]:

• [404] https://docs.funkwhale.audio/admin/configuration.html#api-configuration | Failed: Network error: Not Found

[./CONTRIBUTING.md]:

• [404] https://docs.funkwhale.audio/developers/index.html | Cached: Error (cached)

[./CHANGELOG.md]:

• [404] https://docs.funkwhale.audio/admin/upgrading.html | Failed: Network error: Not Found
• [404] https://docs.funkwhale.audio/admin/external-storages.html | Failed: Network error: Not Found
• [404] https://docs.funkwhale.audio/admin/external-storages.html#no-resolver-found | Failed: Network error: Not Found
• [404] https://docs.funkwhale.audio/upgrading/0.17.html | Failed: Network error: Not Found

[./README.md]:

• [404] https://docs.funkwhale.audio/developers/index.html | Failed: Network error: Not Found