Add configurable title and subtitle v0.6.1

.env.example

@@ -7,6 +7,10 @@ APP_PORT=8080
 
 # Optional settings
 APP_NAME=Photo Date Editor
+# Optional visible page heading. Falls back to APP_NAME when omitted.
+APP_TITLE=Mork Photo Date Editor
+# Optional text shown directly below the page heading.
+APP_SUBTITLE=Family photo metadata editor
 MAX_UPLOAD_MB=150
 LOG_LEVEL=INFO
 
@@ -23,4 +27,4 @@ DEFAULT_MAP_LON=11.0
 DEFAULT_MAP_ZOOM=5
 GEOCODER_URL=https://nominatim.openstreetmap.org/search
 # Optional custom identification sent to the geocoder. The default uses APP_NAME, version and APP_URL.
-# GEOCODER_USER_AGENT=MorkPhotoDateEditor/0.5.0 (+https://edit.mork.fyi)
+# GEOCODER_USER_AGENT=MorkPhotoDateEditor/0.6.1 (+https://edit.mork.fyi)