v8.3.0

Users:
"Show what I can work on"
Enable Undo when first transcription is OCR
Service letter signature update
Add check and messaging for Openseadragon error loading images
Add Next transcribeable/reviewable to Campaigns dashboard
 
Admin:
User activity alert email

Housekeeping:
Bootstrap 5
Cloudflare Turnstile
Additional tests for Views
Various UI tweaks for consistency
Various dependency security updates