Update index.html

Updated the All Hands Active description to reference the free + open hours to the general public.
Update index.html

Added the Digital Humanities Collective.
Adding Ann Arbor Women Coders Group
URL for AAWC
Merge pull request #2 from joshdont/patch-1

Update index.html
Merge pull request #5 from jewlofthelotus/patch-1

Adding Ann Arbor Women Coders Group
Add CHC location
Merge pull request #4 from shoelsch/patch-1

Update index.html
Merge pull request #6 from allspiritseve/master

Add CHC location