docs - improve search functionality

[p-a-a-a-trick]

Please describe the issue

I used the search tool on the website (ibis-project.org) to look for syntax/documentation on basic functionality and none of the top results were what I expected.

Attempting to find information on the sum method (or function) on any expression:

Attempting to find information on the aggregate method on a table expression:

It would be helpful for new users if common operations were ranked higher on basic search results (looking up "sum" would lead you to the various sum functions/methods before the word "summary" or blog posts).

Code of Conduct

• [X] I agree to follow this project's Code of Conduct

[lostmygithubaccount]

potentially useful: https://quarto.org/docs/websites/website-search.html

also once Ibis Birdbrain is more properly done could be an interesting experiment to try search with it

[gforsyth]

@ogrisel posted these in #8086 and I wanted to not lose track of them:

So to conclude, here are some concrete recommendations:

• exact matches with Ibis public function / class names should probably always be ranked at the top;
• the result snippet should highlight the fact that it's an API exact match one or another (at least showing the function / class name in at the beginning of the snippet);
• the result snippet should ideally quote the beginning of the docstring rather than a random excerpt near the end of the docstring.

[ncclementi]

I'm going to take this one, but we should break it in two steps.

1. Integrate Algolia and see if things improve
2. Refine "searchability" according to suggestions of comment above if needed.