jdt.ui Readme outdated

[jukzi]

https://github.com/eclipse-jdt/eclipse.jdt.ui/edit/master/README.md

          @jukzi I do not know how. On the main page of the project, in the [Developer resources](https://github.com/eclipse-jdt/eclipse.jdt.ui#developer-resources) section, the [link](https://projects.eclipse.org/projects/eclipse.jdt.ui/developer) leads to a page without information (or I was looking in the wrong place). In any case, I'm not sure that I can understand the codebase and come up with a quality solution.

Originally posted by @XelaNimed in #1426 (comment)

Links to outdated wiki seem to be not helpful.
Does UI need an own Readme? maybe just use https://github.com/eclipse-jdt/.github/blob/main/CONTRIBUTING.md

[basilevs]

It does but most of the links there are also broken