Milestones in the link section

[CBID2]

Hi everyone! :) What do y'all think of creating a feature where milestones could be displayed in the links section with a checkbox with the same fields? @eddiejaoude came up with this idea while I was reviewing this PR.

[eddiejaoude]

Some of my thoughts...

• note that only milestones with urls can have this feature (toggle)
• maybe the group name for these could be Milestones

[CBID2]

I agree with the first bullet point. As far as giving the group name Milestones, I partially agree due to the consistency, but I think Achievements would be a good group name too. What do you think?