add support for Software Heritage

[eadmaster]

Is your feature request related to a problem? Please describe. add support for Software Heritage (supports many git-based hosting sites)

Describe the solution you'd like should work like the other search engines

Describe alternatives you've considered https://github.com/dessant/web-archives/issues/5 https://github.com/dessant/web-archives/issues/60

Additional context example url of a deleted github repo: https://archive.softwareheritage.org/browse/origin/directory/?origin_url=https://github.com/cyberwarriorx/pcrown