Clean up polluted styles and remove dead CSS code (#24497)
Follow #24393
The funny history:
* At the beginning, `.ui.message` was polluted by `text-align: center`
* Then people do `<div class="ui ... message text left">`
* But `.ui.left` is polluted by `float: left`
* Then people do `#xxx .ui.message { width: 100% !important;}`
The code just becomes more and more hacky.
After removing the pollution, everything becomes clear and straight.
And, this PR also does:
1. Remove the `package.css`, its styles could be provided by `top
aligned`
2. Remove `#avatar-arrow`, dead code
Screenshot:
Co-authored-by: Giteabot <teabot@gitea.io>
48e3e38ee0
