docs: add hosting on Zeabur guidance

[MichaelYuhe]

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[mattermost-build]

Hello @MichaelYuhe,

Thanks for your pull request! A Core Committer will review your pull request soon. For code contributions, you can learn more about the review process here.

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[MichaelYuhe]

/check-cla

[MichaelYuhe]

/check-cla

[mattermost-build]

This PR has been automatically labelled "stale" because it hasn't had recent activity. A core team member will check in on the status of the PR to help with questions. Thank you for your contribution!