Support x.com to support new Twitter logo

[wildekek]

What problem does this PR solve?

Since Twitter is in a rename to become x.com and changed its logo to 𝕏, I added support to for this as an addition to the normal twitter bird logo.

Is this PR adding a new feature?

• Support params.socialIcons "x"
• Added it to the README

Is this PR related to any issue or discussion?

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.

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[sonarcloud]

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[hugo-sid]

Hi @wildekek, thanks for adding x.com icon.

I appreciate your contribution to this theme.