[wp-meta] [Making WordPress.org] #5019: Switch to `manifest.json` in Block Editor docs importer

[Making WordPress.org]

#5019: Switch to `manifest.json` in Block Editor docs importer
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 Reporter:  chrisvanpatten  |      Owner:  (none)
     Type:  task            |     Status:  new
 Priority:  normal          |  Milestone:
Component:  Handbooks       |   Keywords:
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 In #4388 we set up a `manifest-devhub.json` file in the block editor repo
 as the source for the devhub manifest.

 The patch (to be attached) reverts it to use `manifest.json`. I've also
 rebased the [https://github.com/WordPress/gutenberg/pull/15639 associated
 PR] in the Gutenberg repo, so it's ready to go.

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Ticket URL: <https://meta.trac.wordpress.org/ticket/5019>
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