What does this PR change? What problem does it solve?

• Adds Icon for Sourcehut
  • The license for the SVG used can be found on Sourcehut's website

Icon in action in Profile Mode:

(Other icons included for display purposes)

• Dark Mode
  
• Light Mode
  

Was the change discussed in an issue or in the Discussions before?

• Sourcehut Icon request in Add Social Icon for Sourcehut #963

PR Checklist

• This change adds/updates translations and I have used the template present here.
• I have enabled maintainer edits for this PR.
• I have verified that the code works as described/as intended.
• This change adds a Social Icon which has a permissive license to use it.
• This change does not include any CDN resources/links.
• This change does not include any unrelated scripts such as bash and python scripts.
• This change updates the overridden internal templates from HUGO's repository.