add origin (and search) example to the FUSE tutorial

Starting with swh/devel/swh-fuse#2784 (closed) SwhFS now supports browsing the visits of a given origin URL. The tutorial should then start from it, rather than assuming users magically obtain SWHIDs to browse via FUSE.

Now that swh web search is also available from swh-web-client, we should also include showing how to search for the desired origins.

Migrated from T2825 (view on Phabricator)

Edited Jan 08, 2023 by Phabricator Migration user

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