Setup Algolia documentation search and see how it works

[acorncom]

- Copy the following CSS/JS snippets and add them to your page

<!-- at the end of the HEAD -->
<link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css" />
<!-- at the end of the BODY -->

<script
type="text/javascript"
src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script>

<script
type="text/javascript"> docsearch({
apiKey:
'70c6f2593b56f14e561a361d1b787a1e',

indexName: 'emberjs',
inputSelector: '### REPLACE ME ####',
algoliaOptions: {
'hitsPerPage': 5,
'facetFilters': '### REPLACE ME ####'
}
}); 
</script>

- Add a search input if you don't have any yet, and update the inputSelector value in the code snippet to a CSS selector that targets your input field.
- Add the logic to search only in the good set of tags:
if you want to search on guide 2.3.0 and the api:
'facetFilters': '(tags:api,tags:v2.3.0)'
If you want to search only in the api it will look like:
'facetFilters': '(tags:api)’

Possible tags are: “api”, “v1.10.0”, “v1.11.0”, “v1.12.0”, “v1.13.0”, “v2.0.0”, “v2.1.0”, “v2.2.0”, “v2.3.0” 

- Optionally customize the look and feel by following the DocSearch documentation

If this works well, I imagine we're going to want to add it to the API pages and the main website as well. Probably worth putting in a separate JS file that we'll aim to make global (and have it read the versions.js file for the appropriate version tag to use).

[jeradg]

I'll investigate this afternoon.

[acorncom]

This has been merged, thanks!