message: Update config.json docs location
  Part of
diff: @@ -67,7 +67,7 @@ export default class AutoDiscoveryUtils {
  {}, {
  a: (sub) => {
  return <a
  - href="https://github.com/vector-im/riot-web#configjson"
  + href="https://github.com/vector-im/riot-web/blob/master/docs/config.md"
  target="_blank"
  rel="noopener"
  >{sub}</a>;
  