✏️(frontend) fix GitHub capitalization

[karlhorky]

Purpose

Fix capitalization of the brand GitHub

Proposal

• Fix capitalization of GitHub

External contributions

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• I have read and followed the contributing guidelines
• I have read and agreed to the Code of Conduct
• I have signed off my commits with git commit --signoff (DCO compliance)
• I have signed my commits with my SSH or GPG key (git commit -S)
• My commit messages follow the required format: <gitmoji>(type) title description
• I have added a changelog entry under ## [Unreleased] section (if noticeable change)
• I have added corresponding tests for new features or bug fixes (if applicable)

[karlhorky]

@AntoLC looking at the CI failures:

1. 3: B6 Body message is missing https://github.com/suitenumerique/docs/actions/runs/16801989694/job/47633068291
2. Check that the CHANGELOG has been modified in the current branch https://github.com/suitenumerique/docs/actions/runs/16801989694/job/47633068314

For 1, not sure if this commit format is correct?

• 7931013 (#1274)

For 2, I was trying to understand what it is trying to tell me. At first glance, it appears to want a changelog entry for this PR. However, looking at the workflow, it shows an exception for PRs with noChangeLog labels.

Should this PR have this noChangelog label? Or should I actually add a changelog entry for this typo fix?