feat: change font-awesome icon lib by fork-awesome

[abs0lom]

When I wanted to add a matrix.org link to my list of profiles, I saw that font-awesome did not have this icon. The fork of this project, fork-awesome, has this icon and allows PRs to add new icons. So I created a branch to change one for the other.

However, I'm not sure if another icon than the matrix.org one is missing in font-awesome. I'll let you close this PR if you don't think this change is appropriate.

Thanks for your work