Update deprecated setting for static storage (#95)

So far, the variable for static storage in `settings.py` was called `STATICFILES_STORAGE`. Since Django 4.2, this is deprecated and now part of a dict called `STORAGES`.  See https://docs.djangoproject.com/en/5.1/ref/settings/#storages

qlever/settings.py

@@ -126,7 +126,16 @@
 
 STATIC_VERSION = ""
 
-STATICFILES_STORAGE = 'whitenoise.storage.CompressedManifestStaticFilesStorage'
+STORAGES = {
+    'default': {
+        # Django's default
+        'BACKEND': 'django.core.files.storage.FileSystemStorage'
+    },
+    'staticfiles': {
+        # Use WhiteNoise (https://whitenoise.readthedocs.io) for static file serving
+        'BACKEND': 'whitenoise.storage.CompressedManifestStaticFilesStorage'
+    },
+}
 
 try:
     # Get git info from files in .git