Update search more frequently

[morancj]

Problem

Algolia DocSearch runs a crawl every 7 days. If the release schedule doesn't coincide nicely with this, it can take that long before the current version returns any search results. We noticed this when 0.18.0 was released.

Solution

Algolia used to have a self-hosted crawler: this has been deprecated.
Now, we can only schedule the crawl, or trigger it manually. (permalink)

Current config snippet:

schedule: "at 10:00 on Saturday",

I'm not sure where this is configured: it seems to only be available in the admin web UI.

I suggest we replace this with:

schedule: "every 1 day at 6:00 pm",

adopted from their example.

Additional context