Add daily-stone page showing a different mineral each day

New dailystone app with 207 minerals scraped from Wikipedia.
Each day displays a different mineral with photos, formula,
properties, description, and history. Page theme color matches
the mineral's typical appearance.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

entrypoint.sh

@@ -1,6 +1,18 @@
 #!/bin/sh
 set -e
 python manage.py migrate --noinput
+
+# Load mineral data if the table is empty
+python manage.py shell -c "
+from dailystone.models import Mineral
+if Mineral.objects.count() == 0:
+    from django.core.management import call_command
+    call_command('loaddata', 'minerals')
+    print(f'Loaded {Mineral.objects.count()} minerals')
+else:
+    print(f'{Mineral.objects.count()} minerals already loaded')
+"
+
 exec gunicorn kboris.wsgi:application \
     --bind 0.0.0.0:8080 \
     --workers 2 \