feat(ui): add desktop footer, legal custom link and about dialog

docker-compose.yml

@@ -40,6 +40,9 @@ services:
       - LEGAL_PRIVACY_CONTENT=${LEGAL_PRIVACY_CONTENT:-}
       - LEGAL_IMPRINT_CONTENT_FILE=${LEGAL_IMPRINT_CONTENT_FILE:-}
       - LEGAL_PRIVACY_CONTENT_FILE=${LEGAL_PRIVACY_CONTENT_FILE:-}
+      # Eigener Link im Footer (nur https://)
+      # - LEGAL_CUSTOM_LINK_LABEL=${LEGAL_CUSTOM_LINK_LABEL:-}
+      # - LEGAL_CUSTOM_LINK_URL=${LEGAL_CUSTOM_LINK_URL:-}
       # Bilder und Audio in Notizen
       - MEDIA_MAX_IMAGE_MB=${MEDIA_MAX_IMAGE_MB:-15}
       - MEDIA_MAX_AUDIO_MB=${MEDIA_MAX_AUDIO_MB:-50}