Place the table of content feature in the header.

[mtias]

Making some tweaks to the placement of the table of contents button.

[codecov]

Codecov Report

Merging #3459 into master will decrease coverage by 0.54%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #3459      +/-   ##
==========================================
- Coverage   33.86%   33.31%   -0.55%     
==========================================
  Files         253      256       +3     
  Lines        6736     6852     +116     
  Branches     1223     1251      +28     
==========================================
+ Hits         2281     2283       +2     
- Misses       3756     3842      +86     
- Partials      699      727      +28

Impacted Files	Coverage Δ
editor/modes/visual-editor/index.js	0% <ø> (ø)	⬆️
editor/header/header-toolbar/index.js	0% <0%> (ø)	⬆️
editor/table-of-contents/index.js	0% <0%> (ø)	⬆️
editor/modes/visual-editor/block.js	0% <0%> (ø)	⬆️
editor/sidebar/block-inspector-panel/index.js	0% <0%> (ø)
editor/components/block-inspector/index.js	14.28% <0%> (ø)
...or/components/block-inspector/advanced-controls.js	4.76% <0%> (ø)

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[mtias]

This could use some better explanation.

[afercia]

Moving it away from the content region is a nice improvement thanks 🙂

This change would also partially solve #3216 because it adds an aria-label (and I guess also a tooltip. Maybe the wording __( 'Information' ) could be improved, but that can be reviewed later, see #2387
Would be great to add also an aria-expanded attribute too.

[karmatosed]

Looks great, it's an improvement and opens up the editing area.

[youknowriad]

Nice. 👍

[mtias]

@afercia yes, thought you might appreciate it :) Agree on the wording, left a comment about it. Also added expanded role.