Final call: Put definition examples in separate pages

Hey folks,
This pull requests moved examples out of definitions into separate files.
This makes the definition section shorter, and emphasises the point that
following these examples is not required for consistency with the rules.

This final call ends August 20th. If you have any feedback, leave a review
before that time:
https://github.com/act-rules/act-rules.github.io/pull/1406

-- 
*Wilco Fiers*
Axe for Web product owner - Co-facilitator WCAG-ACT - Chair ACT-R