Replace "contribute" with "/contribute" in menu link

[I-Valchev]

The link breaks on this page (and any other one which is not top-level)
https://boltcms.io/newsitem/2-new-milestones-monthly-community-meet-ups

[aryasoni98]

I would like to work on it !

[I-Valchev]

Hi @aryasoni98 , sure, please go ahead. I'm assigning this issue to you, so it does not get picked up elsewhere. 👍

[aryasoni98]

@I-Valchev sir, can u little bit brief me about the issue