Ga release notes title override

[gabriele-ct]

Create the possibility of override the sidebar site title link href which by default links to the site root.

Closes #5358

DoD guidelines

• [x] user documentation added?
• [ ] stakeholders approve changes? (if needed)

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🦋 Changeset detected

Latest commit: b7f9663d7ee2a0cb348a6f6006d5070eda028094

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 6 packages

| Name | Type | | ----------------------------------------------- | ----- | | @commercetools-docs/gatsby-theme-docs | Minor | | @commercetools-website/docs-smoke-test | Minor | | @commercetools-website/api-docs-smoke-test | Patch | | @commercetools-website/documentation | Patch | | @commercetools-website/self-learning-smoke-test | Patch | | @commercetools-website/site-template | Patch |

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🚚 Build Process Details

Preview URLs:

• https://docskit-ga-release-notes-title-override.commercetools.vercel.app (permalink to the last build of this branch)
• https://docskit-sha-ce27980901364c2258da9b363d084e86d021c426.commercetools.vercel.app (this commit)