Index h3s in docs for search

[kimberleyamackenzie]

I was searching for a specific piece of info about deployments, and I searched the term "dependency installation" in docs.
My search returned 0 results, and I had to ask someone on the project for details, and they linked me to this page - https://www.pulumi.com/docs/pulumi-cloud/deployments/reference/#customizing-the-dependency-installation-step. I was surprised that I didn't find that via search, given the phrase appears in the h3 there.

[thoward]

This is a good call out. According to the script that builds the index, we've explicitly chosen not to include H3s because they are "too noisy": https://github.com/pulumi/docs/blob/master/scripts/search/page.js#L54 ...

I'm going to close this as "by design". However, it's worth consider if this design is ideal or not... Including all H3s as well as H2s is a very small change to the jQuery selector in that same code location.

@interurban @sean1588 If you think we should add these, we can reopen and get a PR in right away.

[thoward]

After some discussion, going to reopen and fix this.