Rename to uffd-nginxauth and Debian package

debian/contrib/uffd-nginxauth.cfg

+FLASK_ENV="production"
+#SECRET=autogenerated by postinst script
+
+# URLs of the OAuth2-based identity provider (must be set!)
+#OAUTH2_AUTH_URL = 'http://localhost:5001/oauth2/authorize'
+#OAUTH2_TOKEN_URL = 'http://localhost:5001/oauth2/token'
+#OAUTH2_USERINFO_URL = 'http://localhost:5001/oauth2/userinfo'