Broken links

lychee found some 404:

https://dev.funkwhale.audio/funkwhale/funkwhale/-/jobs/179969

[./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

🔍 320 Total ✅ 303 OK 🚫 7 Errors (HTTP:7) 💤 10 Excluded