RFE: add Perplexity.ai search engine

[asterbini]

Tabliss is a real beauty! Thanks a lot for your hard work!

I find Perplexity.ai refreshing.
Please add it to the Search Engines list

[BookCatKid]

Hi! This project has not been active in a while. If you want this, feel free to download TablissNG (my fork) and either use the nightly version, or just insert https://www.perplexity.ai/search?q={searchTerms} into the custom search engine option.