Theme changes

[mfaani]

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

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

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.

[sonarcloud[bot]]

Quality Gate failed

Failed conditions
C Reliability Rating on New Code (required ≥ A)

See analysis details on SonarCloud

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