Provide links to existing guides from the WebApp

For example put links on https://archive.softwareheritage.org/browse/help/

Also decide how to organize https://docs.softwareheritage.org/user/

---

Migrated from T3908 (view on Phabricator)

added Documentation Web app priority:Normal labels

I think the proper place for that link would be the Permalinks tab.

mentioned in commit swh/devel/swh-web@4ed4512e

Another option by @anlambert for better visibility:

• put it in the homepage I think, maybe by adding a new sentence in the Overview section

closed

moved to swh/devel/swh-web#4732