docs: update documentation for v0.5.3

- Refresh administrator guide
- Update architecture documentation
- Document Registry Validator
- Document Registry Repair Framework
- Update backup and restore guide
- Refresh CLI documentation
- Update Docker deployment example
- Bump version to v0.5.3

Cargo.lock

@@ -345,7 +345,7 @@ checksum = "1e748733b7cbc798e1434b6ac524f0c1ff2ab456fe201501e6497c8417a4fc33"
 
 [[package]]
 name = "bzod"
-version = "0.5.2"
+version = "0.5.3"
 dependencies = [
  "argon2",
  "askama",