Develop new approach to documenting and maintaining information about editors and acknowledgements

[mcking65]

At launch of wai/aria/apg on May 19, 2022, we are extracting information about current editors, past editors, and acknowledgements from the old aria-practices.html respec doc. This doc pulled some information from aria-common.

• Where do we want to maintain such information?
• Should the APG rely on an external source for some of the information?
• To what extent should we maintain acknowledgements about major contributions to past versions?
• What information should be included in every page footer?

Some of the guiding principles the TF has used in the past:

• Author names are not included in source comments because all source is a work of the entire TF, there are often multiple authors over time, and it is difficult to ensure such information is accurate.
• Similarly, the TF strives to convey that the APG is developed with the broader accessibility community.
• At the same time, the APG TF understands it is important to provide appropriate individual recognition for contributions
  Related: Develop page footer for all APG pages that is more consistent with WAI page footers #87