Improvements to search

Currently the search only returns at max 30 artifacts and then duplicates the results for each version (if the version was not part of the search query).

This as a few drawbacks:
1. It hides that you hit a search limit and that there might be more results (because the hit count changes depending on how many versions a found artifact has)
2. It is hard to see which artifacts have been found as there are many duplicate entries

Proposal:
Use a similar way as on search.maven.org -> Only display the latest version found and display a link next to it, which shows the version overview of this artifact and the number of existing versions