cli: add --config-file option to 'swh web' group

Closes #2872 (closed).

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Migrated from D4740 (view on Phabricator)

Some references in the commit message have been migrated:

• T2872 is now #2872 (closed)

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Patch application report for D4740 (id=16787)

Rebasing onto 4b1e7632...

Current branch diff-target is up to date.

Changes applied before test

commit b2df1673fbf848bbe318f70a07c1921aa1c47751
Author: Thibault Allançon <haltode@gmail.com>
Date:   Tue Dec 15 11:04:31 2020 +0100

    cli: add --config-file option to 'swh web' group
    
    Closes #2872.

See https://jenkins.softwareheritage.org/job/DWCLI/job/tests-on-diff/36/ for more details.

LGTM (but please fix the minor docstring point I've mentioned before landing)

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