Enable elasticsearch in pages
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=10793) </details> <!--IssueSummary end--> ### Problem to solve It'd be fantastic if the search engine could parse the static pages in each projects. ### Proposal Pass any `.html` or `.txt` files in the Pages `artifacts.zip` into into the elasticsearch cluster, and make it searchable at global, group, or project level, just as we do for (say) snippets. We'd probably want to preprocess HTML content to strip tags, etc. We deal with search on our own static site via algolia and oodles of client-side javascript; this could be a neat way to offer a simple, embeddable search form for all our Pages sites.
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