1. merge `repo-template.ts` into `repo-new.ts` (they are all for "/repo/create")
2. remove jquery
3. fix an anonying fomantic dropdown bug, see the comment of `onResponseKeepSelectedItem`
Only move code, no unnecessary logic change. (There are many problems in
old code, but changing them is not in this PR's scope)
Co-authored-by: Giteabot <teabot@gitea.io>