Use `jekyll-mentions` for linking GitHub profiles for commits & PRs section

[jessesquires]

https://github.com/jekyll/jekyll-mentions

currently we (sometimes) do this manually. this should allow us to just type @username and have it automatically "linkified".

we'll probably need to audit old issues to use this once implemented.

[BasThomas]

Nice! I can do the audit. :)

[jessesquires]

🎉 Thanks @BasThomas !

Just need to add it here to enable it https://github.com/SwiftWeekly/swiftweekly.github.io/blob/master/_config.yml#L6

[jessesquires]

Also, turns out we can remove this from the gemfile: https://github.com/SwiftWeekly/swiftweekly.github.io/blob/master/Gemfile#L4

(it's included in github-pages)

[jeroenleenarts]

Am I correct in concluding that the suggested feature in this ticket has been implemented back in 2018?

[jessesquires]

No, nothing implemented.

The discussion above was just about including the dependency.