* Move htmlIdGenerator to ui_framework
* Use jest expect instead of chai
* Add htmlIdGenerator to accessibility styleguide
* Improve the writing of the accessibility styleguide
* Initial version of a11y guide
* Move a11y content from HTML guide to a11y guide
* Add PR feedback
* Add PRs feedback
* Add more roles
* Refactor labeling elements section
* Rename "labeling elements" -> "naming elements"
* Use span instead of i for icon examples
* Correct typo