UnyCloud v0.26.1

Changes in UnyCloud v0.26.1:

✅Changed README.md
✅Changed RELEASE_NOTES.md
✅Changed UNYCLOUD_VERSION
✅Changed docs/MAINTENANCE.md
✅Changed docs/installation.md
✅Changed frontend/package.json
✅Changed frontend/src/css/unycloud.css

Commit: 5733a37