### What problem does this PR solve?
- Update version tags in README files (including translations) from
v0.21.0 to v0.21.1
- Modify Docker image references and documentation to reflect new
version
- Update version badges and image descriptions
- Maintain consistency across all language variants of README files
### Type of change
- [x] Documentation Update
### What problem does this PR solve?
1. Update architecture image
2. ragflow-cli doesn't indicate the version
### Type of change
- [x] Documentation Update
Signed-off-by: Jin Hai <haijin.chn@gmail.com>