Show wiki empty state layout on wiki-only project overview page
Problem to solve
If I create a wiki-only project without a repository, the project landing page shows an empty Wiki, which is fine.
However, since we already have an awesome empty state illustration for empty wikis, we should add this to this special case as well.
- Create a new project only, disabling any permissions (project features) but Wiki
- Project landing page correctly shows the wiki, see https://gitlab.com/akaemmerle/example-project-wiki-only01
- Empty state is not following our empty state pattern
Add the existing empty state layout and illustration to wiki-only projects, below the project header.
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