Fix badges for SWHAP with .svn extension

Possibly by creating badge link with .svn extension @anlambert would it be possible to have an additional link to a badge with .svn extension? https://archive.softwareheritage.org/badge/origin/https://github.com/Unipisa/TAUmus/badge.svn the same way it replies to https://archive.softwareheritage.org/badge/origin/https://github.com/Unipisa/TAUmus/ Will this resolve the issue?

@scatenag thinks the problem is that we have not a link to an image (Eg. image.svg) This causes latex to fail.

In search of a solution for a fails with latex compiler:

Migrated from T2149 (view on Phabricator)

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