"save code now"

The web app should grow a submission interface to allow people to request archiving of a specific origin.

As a first approximation a form similar to Internet's Archive "save page" one could be added. Differently from IA, however, we will not save the page "now", but rather "ASAP", adding the relevant job to our update queue.

Right now we can easily support this for Git (even though the question about the job priority is open…), but ideally this should be something generic, with either auto-detection of the right kind of job, or the ability for the user to specify the kind of origin (git, svn, tar, etc).

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Migrated from T336 (view on Phabricator)