feat: add vercel deployment guide (#7131)

* feat: add vercel deployment guide

* fix: make guide discoverable

* Optimised images with calibre/image-actions

* Update content/800-guides/380-vercel-app-deployment.mdx

Co-authored-by: Petra Donka <[email protected]>

* fix: add feedback

* fix: add gif

* fix: spelling mistake

* fix: minify the gif image

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Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Petra Donka <[email protected]>

Author: 3 people