WIP: Resolve "Project: Improve empty repository state UI [UX]"

What does this MR do?

It cleans up the empty project overview.

The following information is removed from this page:

• No. of commits, branches, tags, bytes/files in the header
• Buttons Enable Auto DevOps, Add Kubernetes cluster
• Remove project button at the bottom of the page.

In addition, irrelevant text is removed from and some parts are reworded.

Screenshots:

before	after

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/issues/52420

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer

Closes #52420 (closed)