several small above the fold + nav edits

[ashumz]

• change portfolio to projects
• change team to "who are we?"
• add black/white icons for slack, twitter, meetup, github - under "Join Us" button
• Link Join Us button to our meetup site - http://www.meetup.com/CodeForBoulder/

[Dave-Hughes]

Completed all of these tasks, but can't move the card!

[ashumz]

You'll need to accept the invitation for the org - try going to github.com/codeforboulder and see if you see the banner at the top re: the invitation :)

[ashumz]

You should be able to push your changes once you do that, too