* refactor: rewrite form fields

1. The theme palette has been updated because of the new form fields.
2. Extracts old `Scope` component to `components/` for next use.
Signed-off-by: Yue Yang <g1enyy0ung@gmail.com>

* fix: license checker
Signed-off-by: Yue Yang <g1enyy0ung@gmail.com>

* chore: address comments
Signed-off-by: Yue Yang <g1enyy0ung@gmail.com>
Co-authored-by: Ti Chi Robot <ti-community-prow-bot@tidb.io>