Update the A+ authors page after a new release

[markkuriekkinen]

https://apluslms.github.io/about/authors/
https://github.com/apluslms/apluslms.github.io/blob/master/about/authors/index.md

Remember that there is a script for gathering authors from git commits in the repo:
https://github.com/apluslms/apluslms.github.io/tree/master/about/authors

The script requires a data file that is stored in the private management repo:
https://github.com/apluslms/project-management/tree/master/apluslms.github.io/about/authors

[markkuriekkinen]

I have updated the authors page in January 2021. I will keep this issue open so that it stays as a reminder to update the authors after each A+ release.