#### What type of PR is this?
/area ui
/kind improvement
/milestone 2.21.x
#### What this PR does / why we need it:
Add empty state for some dashboard widgets
#### Does this PR introduce a user-facing change?
```release-note
None
```
* refactor: redesign ui of comment management page
Signed-off-by: Ryan Wang <i@ryanc.cc>
* Add comment detail modal
Signed-off-by: Ryan Wang <i@ryanc.cc>
* Add reply detail modal
Signed-off-by: Ryan Wang <i@ryanc.cc>
* Improve ui
Signed-off-by: Ryan Wang <i@ryanc.cc>
* Add pending comments widget
Signed-off-by: Ryan Wang <i@ryanc.cc>
* Improve ui
Signed-off-by: Ryan Wang <i@ryanc.cc>
* Improve ui
Signed-off-by: Ryan Wang <i@ryanc.cc>
---------
Signed-off-by: Ryan Wang <i@ryanc.cc>
Ryan Wang