Add Ability to actually Search the docs for keywords.

[dellis1972]

People do not use our docs it seems.
Our current indexing is in adiquate. It does not allow users to search for specific topics or keywords. Only for titles on existing pages, which suggest you need to know which page you want in the first place.

We should add the ability to search for words and filter the docs accordingly.

[kimmcintyre]

It looks like DocFX templates have this metadata field called _enableSearch which can be applied to the globalMetaData object in the docfx.json to add a search bar to the site. The search results aren't amazing but you can generally search by a class name and get the class's page as the first result. Here's the search bar on my local doc site returning results for DepthStencilState.

Do you think that enabling DocFX's search bar is sufficient for this issue?

edit: I dived a bit deeper into how DocFX's search engine works. It's actually just lunr.js under the hood so refined search queries are possible based on lunr's doc.

[dellis1972]

@kimmcintyre if it works feel free to post a PR, I think it will help allot of people to be able to search for things.