Revert "add sign up link to join coreteam (#326)"
Revert "add sign up link to join coreteam (#326)"

This reverts commit 6dc4ff0abcc756d21a82dadd94d9072f31f498b5.
If you would like to join coreteam, do feel free to just send us
an email at coreteam@nushackers.org. We are friendly!

nushackers/nushackers-site,nushackers/nushackers-site,nushackers/nushackers-site