refactor: rebrand application from "Radarr Language Dashboard" to "Media Max" across all files

Update project name from "Radarr Language Dashboard v2" to "Media Max" in README.md, docker-compose.yml service/container names, app.py logger name and service definition, manifest.json name/short_name/description, and templates/index.html title and header elements. Update docker exec command example in README to use new container name.

docker-compose.yml

@@ -1,7 +1,7 @@
 services:
-  radarr-language-dashboard:
+  media-max:
     build: .
-    container_name: radarr-language-dashboard
+    container_name: media-max
     restart: unless-stopped
     ports:
       - "8099:8099"