Move the docs to WordPress.org

[pento]

Docutron was lovely, but it's time to move the docs across to WordPress.org.

The docs will live here: https://wordpress.org/gutenberg/handbook/

WordPress.org will sync the docs from master every 15 minutes (though syncing is currently disabled, until this PR is merged).

[codebykat]

I fixed a couple typos, other than that this is looking good. Didn't see any missed references to docutron and everything still builds fine. 👍

[Soean]

Should be meetups.md

[pento]

Good catch, thanks @Soean!

[codecov]

Codecov Report

Merging #3381 into master will increase coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3381      +/-   ##
==========================================
+ Coverage   31.35%   31.44%   +0.09%     
==========================================
  Files         246      248       +2     
  Lines        6778     7073     +295     
  Branches     1218     1320     +102     
==========================================
+ Hits         2125     2224      +99     
- Misses       3915     4042     +127     
- Partials      738      807      +69

Impacted Files	Coverage Δ
blocks/editable/index.js	9.77% <ø> (-1.26%)	⬇️
blocks/api/raw-handling/image-corrector.js	78.78% <0%> (-21.22%)	⬇️
blocks/library/latest-posts/index.js	9.09% <0%> (-0.91%)	⬇️
utils/mediaupload.js	20.83% <0%> (ø)	⬆️
editor/block-settings-menu/index.js	0% <0%> (ø)	⬆️
blocks/library/image/block.js	0% <0%> (ø)	⬆️
utils/blob-cache.js	25% <0%> (ø)
components/navigable-container/index.js	95.16% <0%> (ø)
components/autocomplete/index.js	77.72% <0%> (+0.79%)	⬆️

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[youknowriad]

Sad to see docutron go away. We will never be able to embed components this way. But I understand this is not in the direct scope of Gutenberg.

I think the menu order is not correct. The previous/next links are broken too.

[aduth]

I think the menu order is not correct.

Might make more sense for manifest.json to be defined as an array vs. an object.

[pento]

Might make more sense for manifest.json to be defined as an array vs. an object.

Good idea, I've update the theme and this PR to do exactly that, it gets the menu order from the manifest.json array order.