Include accessibility sections in Scenery Documentation

[pixelzoom]

Related to https://github.com/phetsims/special-ops/issues/269 ...

In Slack#a11y-dev, I asked:

From scenery/doc/ (the homepage for Scenery documentation) there is currently no way to navigate to any of the sections in scenery/doc/accessibility/, or even know that they exist. Should those sections (“Accessibility with Scenery” and “Voicing with Scenery”) be discoverable and navigable from the Scenery documentation? Is that important for SceneryStack/POSE?

@jessegreenberg said:

Ya, we should make it more discoverable and I think that is important for POSE.

It can be found here, but this isn't the most intuitive spot: https://phetsims.github.io/scenery/doc/#accessibility

In general, more structure for https://phetsims.github.io/scenery/doc/ would be helpful.

[marlitas]

@jonathanolson and @brettfiedler will you be working on this as part of the POSE/ SceneryStack documentation?

[brettfiedler]

It's within scope, though not sure of the timeline or if it will be on the Scenery doc website or integrated into the SS website. You can have me assigned for now.

Of note, I currently link out to the Scenery a11y section on the SceneryStack website in at least two locations.