Improve doc search experience on Quarkus docs landing page to include full-text search

[michelle-purcell]

Description

When you search for information on the Quarkus docs home page by using a keyword string on the search bar, the search results are limited to matches in the title, summary, (1st sentence:abstract/preamble), or header keywords.

The text in the main body of a guide is not included in the search indexing so readers cannot find content about popular technology examples such as postgresql. If you search for 'postgresql` today, you find zero doc results. This is "working as designed" and because examples of product/service/component nouns in content can often be mentioned deeper into the main body of the content guide rather than the heading part.

Implementation ideas

Would be better if the Jekyll search in Quarkus feature was extended to support a full-text search rather than a simple 'light' keyword search.

If this is not possible, the Quarkus doc contributor guide and templates also need to make it clearer so that keywords are included somewhere in the title, abstract or header section of the adoc.

[quarkus-bot[bot]]

/cc @MichalMaler (documentation), @ebullient (documentation), @hmanwani-rh (documentation), @inoxx03 (documentation), @sheilamjones (documentation), @sunayna15 (documentation)

[michelle-purcell]

Thanks @yrodiere.