Research indexing content for quick filter or search features

[peterblazejewicz]

As discussed and requested here:
#280 (comment)
It could be helpful for the users to have a way to filter out items in the content TOC or - which is better solution for finding topics using common search words - to index content and provide a full text search capabilities with a tools like https://community.algolia.com/docsearch/

Thanks!

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