adding social media icon threads

[pmatula]

What problem does this PR solve?

Adding the social media icon threads.

Is this PR adding a new feature?

nope, just an icon.

Is this PR related to any issue or discussion?

no.

PR Checklist

• 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 external library/resources.
• This change does not include any unrelated scripts (e.g. bash and python scripts).
• I have enabled maintainer edits for this PR.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

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[hugo-sid]

Thanks @pmatula.