improve oidc-gen.desktop file
[Desktop Entry]
-Version=1.0
+Version=1.1
Name=oidc-gen
Comment=oidc-gen auth code redirect
Icon=utilities-terminal
Terminal=true
Type=Application
-Categories=Application;Network;
MimeType=x-scheme-handler/edu.kit.data.oidc-agent;
+NoDisplay=true
+Keywords=oidc-agent;authorization code;code exchange;redirect;
