Fix resolution of URLs that were generated for deposits when SWH is the client

The origin URL we generate with a UUID for the SWH client, in the deposit, should be resolvable- to the same artifact that is archived.

• For example: https://archive.softwareheritage.org/swh:1:dir:ef04a768181417fbc5eef4243e2507915f24deea;origin=https://www.softwareheritage.org/check-deposit-2020-02-13T23:15:40.285631;visit=swh:1:snp:6665d47a4d2a19c6e01ddeaf0227e23cb393d2a3;anchor=swh:1:rev:c6a9c5c856e8ea9daffb588c091f9a3876ba3cc3/

Currently it goes from the WebApp to an not existing blog page.

Not sure if this is in the scope of the WebApp or the Deposit.

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Migrated from T2753 (view on Phabricator)