Update/quickstart routing

[WIP] Needs revision

With a little and simple hack I've been able to map all quickstart `tutorial-navigator` routes inside the app, and also add those to `sitemap.xml`.

There are a few things to review before release, for SEO improvements.

- [ ] The alias `/quickstart` for the routes. `/quickstart` and all `/quickstart*` routes will match the same as `/`
- [ ] The `name` for `apptypes`. We have already agreed that `spa-api` for `Single page app` is quite ugly
- [ ] When updating any of `auth0/tutorial-navigator` dependencies `auth0/apptypes`, `auth0/client-platforms` and so... which end into defining routes on docs, and also get to be listed on tutorial navigator, needs to trigger a deploy on this one to map all those routes and list them on sitemap.xml.


/cc @jfromaniello @mgonto @woloski