Make WP-Cron and Cavalcade docs more visible

The documentation at https://docs.altis-dxp.com/cloud/scheduled-tasks/ is not easy to find due its naming, title and keyword content.

Searches for cron and cavalcade rank other pages more highly.

Acceptance criteria:

- [ ] Rename docs page to "Cron Tasks"
- [ ] Page ranks more highly in searches for "cron" and "cavalcade"

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**Original issue:**

There's currently no information about how WP-Cron events are run on Altis Cloud. This is valuable information because the Cavalcade runner is an important part of the reliability, scaleability, and performance of cron events on sites.

Example documentation from VIP: https://docs.wpvip.com/technical-references/tools-for-site-management/cron-control/