docs: add hosting on Zeabur guidance

[MichaelYuhe]

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[mattermost-build]

Hello @MichaelYuhe,

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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.
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