feat: changing the default mode for ai assistant to Gemini

[FFawzy]

changing the default mode for ai assistant to Gemini

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🦋 Changeset detected

Latest commit: 52c4c36f87ebb5956a45681a049b01c4c1534374

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 | Patch | | @commercetools-website/api-docs-smoke-test | Patch | | @commercetools-website/docs-smoke-test | Patch | | @commercetools-website/documentation | Patch | | @commercetools-website/self-learning-smoke-test | Patch | | @commercetools-website/site-template | Patch |

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• https://docskit-ff-ai-gemini.commercetools.vercel.app (permalink to the last build of this branch)
• https://docskit-sha-9cdbbd6f90fa3a1d458bc8192ac0fdf9e1e21778.commercetools.vercel.app (this commit)