At some point it will be necessary to investigate how to apply the native Accessibility in React-Native.

There is an articule about this here: https://facebook.github.io/react-native/docs/accessibility.html

With that investigation, we should be able to figure out what is the work we need to do to make Gutenberg Mobile accessible, and create a guideline for all future UI development work to comply to.

Related issues:
#14
#598
#605
#697

Actions, improve accessibility on:

• Toolbar: PR Accessibility Mark I - Toolbar Buttons #793
• Image block (deselected): PR Improving accessibility on Image Block (deselected) #794
• Image block (selected + toolbar): PR Improve image block accessibility on selected state #920
• Paragraph block: PR Paragraph block accessibility improvements - unselected state #923