Nextcloud 30 - 3.0.2 - Maintenance Update

This updates Splash to work with Nextcloud Hub 7 aka Nextcloud 30.

What did we do this time?

• Introduced compatibility with nextcloud 30
• Changed default searchterms to nature and colorful
• Improve handling of removed providers or missconfigurations

Known Issues:

• Preview does not always work

Full Changelog: v3.0.1...v3.0.2