docs: Apollo mmWave 2.2.6 dashboard choice at setup, admin-only zone changes (#1194)

* docs: Apollo mmWave dashboard created once, on request, from 2.2.6

Apollo mmWave 2.2.6 asks at setup whether to add its dashboard and
whether only administrators can see it, creates it once, and never
recreates, rewrites or deletes it at restart. The options flow is now a
menu that adds or removes that dashboard and chooses its devices.

Update the setup guide to match: the two setup boxes, a "Manage the
dashboard" section for the options menu, the Community dashboards picker
for a second dashboard, taking control, an upgrade note for 2.2.5 and
earlier, and troubleshooting for admin-only visibility, a missing
dashboard and the options errors. Note admin-only visibility in the
tuning guide's prerequisites. Drop the options screenshot, which shows
the removed auto-create checkbox.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* docs: say only administrators can save Apollo mmWave zones from 2.2.6

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

Author: Bunton33