Searches can be typed in before search is initialised

[joellabes]

Describe the bug

In large docs projects, it takes a couple of seconds after the docs page has loaded for the nodes to be ready in the left hand sidebar and in search. This means I pretty regularly open the docs site, start typing a query, and get no results until I delete and re-enter it.

Steps To Reproduce

1. Have a large docs site (I haven't been able to report with jaffle_shop)
2. Open it up, and immediately click into the search bar and type a query
3. When everything does load, see that all nodes display as search results, even though they're not relevant.

Expected behavior

• Either to not be able to search until search is ready
• or when everything does load, re-run the search using the existing search string

Screenshots and log output

2021-01-06_15-02-10.mp4

[joellabes]

I snuck a fix in for this at dc20dee as part of #162, but happy to rework it as needed

[github-actions]

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