rename project from SixFlagsSuperCalendar to Thoosie Calendar

Update package names, Docker image tags, CI/CD workflow, and
documentation to reflect the public brand name. References to
the actual Six Flags theme park chain/API are intentionally kept.

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

docker-compose.yml

@@ -1,6 +1,6 @@
 services:
   web:
-    image: gitea.thewrightserver.net/josh/sixflagssupercalendar:web
+    image: gitea.thewrightserver.net/josh/thoosiecalendar:web
     ports:
       - "3000:3000"
     environment:
@@ -10,7 +10,7 @@ services:
     restart: unless-stopped
 
   backend:
-    image: gitea.thewrightserver.net/josh/sixflagssupercalendar:backend
+    image: gitea.thewrightserver.net/josh/thoosiecalendar:backend
     ports:
       - "3001:3001"
     volumes: