Remove section numbering from contributing
Remove section numbering from contributing

It's very easy to get messed up when adding new sections, as it can be
seen from the following situation where the 9th section is missing, and
I don't think it buys much.

deivid-rodriguez/activeadmin,vraravam/activeadmin,javierjulio/activeadmin,deivid-rodriguez/activeadmin,vraravam/activeadmin,activeadmin/activeadmin,vraravam/activeadmin,javierjulio/activeadmin,mrjman/activeadmin,activeadmin/activeadmin,deivid-rodriguez/activeadmin,javierjulio/activeadmin,activeadmin/activeadmin,mrjman/activeadmin,mrjman/activeadmin