Add craft cross cms guide

[jp-knj]

Description (required)

This PR adds a new CMS guide for Craft Cross CMS

The guide includes links to:

• Official blog post with implementation tutorial
• Sample code repository on GitHub

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en/guides/cms/craft-cross-cms.mdx	Localization added, will be marked as complete.

Warnings reference

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🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[sarah11918]

This LGTM @jp-knj ! What I'm not so good at is evaluating whether the logo SVG is appropriately optimized. I will ask @delucis to just make sure of that.

But otherwise, this has my approval! 🎉

[yanthomasdev]

Good job, LGTM! (after applying Sarah's suggestion)

[jp-knj]

Thanks, I'm happy to follow up on the SVG optimization.
Please let me know