v2.7.24

Documentation bundle for v2.7.24.

Canonical English user & developer guides (markdown + screenshots) frozen at this
release, for syncing into meshtastic.org. Point the sync-apple-docs job at this
release asset (meshtastic-apple-docs-2.7.24.tar.gz) instead of the main branch so the site's Apple docs
only change when a new app version is tagged.