Add documents from docs.typo3.org to search

AC:

• There is a tab where I can filter results from docs.typo3.org
• I can filter those results by versions (e.g. TYPO3 core docs by TYPO3 version)
• In the single search result I can see the documentation (tsref, core, contrib, etc.) where the search word was found
• In the single search result I can see the versions of the documentation where the search word was found