Add PageFind support

[lextm]

Checklist

• I have read and accepted the contributing guidelines.

Is your feature request related to a problem? Please describe

The current integration with simple-jekyll-search is working, but really provides poor search results. Even if keeping client side search a design goal, switching to a more powerful library is necessary.

Describe the solution you'd like

PageFind information can be found in https://pagefind.app/

Just modified my blog to use PageFind, and I can immediately feel the differences this library offers.

Describe alternatives you've considered

There are other options like Lunr.js but not investigated or tested yet.

Additional context

A few commits related:

• lextm@8a25542 Removed simple-jekyll-search and added PageFind
• lextm@7b24edf Integrated with build scripts
• lextm@f724065 Disabled HTML compression