Add latest commit date to the list of projects

[kbsali]

While not always relevant because the latest commit date might not reflect the activity of a project,
it still gives some insight on whether the project is still alive or abandoned.

[bdougie]

This is a great idea and would happily accept a PR on this.

[akanshgulati]

Shall I work on this @bdougie ?

[erquhart]

@akanshgulati if you're up for it, please do!

[akanshgulati]

@erquhart I think we should use some sort of algorithm to check the activity of the project. For ex. a last commit in Readme.md is less relevant than a last PR merge for major release in project.

[erquhart]

Yeah, days since last release might be more meaningful, agreed. Not necessarily major, though.