[BUG] Documentation is not indexed by search engines

Search for +"dash.no_update" site:dash.plot.ly in any search engine (google, bing, duckduckgo). They will all say “no results” (well, Google will unhelpfully display a single result for the documentation of the DatePicker). None will locate the https://dash.plot.ly/state page which mentions dash.no_update three times 😦

[chriddyp]

Update on https://github.com/plotly/dash-docs/issues/647#issuecomment-535994765

1. The pages load faster now, thanks to all of the great Dash performance work in the latest releases (https://community.plotly.com/tag/announcements) but for some pages, still not quite fast enough. Some pages are indexed as the “Loading…” screen 😿
2. Has been done and sitemaps are part of the tests now
3. We have a sidebar and persistent breadcrum now, but it is rendered clientside, so hard to say if that’s helping
4. Still a good idea, and something we’re still planning on doing
5. Still a good idea, and something we’re still planning on doing

Re 1 - Thanks to @eliasdabbas 's great work, we’re adding server-side rendering to the Dash docs so that on initial page load, all of the content will be rendered in HTML. We have high hopes that this will improve the indexing! See @eliasdabbas 's progress in https://github.com/plotly/dash-docs/pull/875

[chriddyp]

We have results on google now.

Hoping the new reference page that covers dash.no_update and more will get indexed soon as well.