Update launch.md

Just some minor changes, plus I have changed 'girls' to 'women' in some text, to avoid ambiguity (some people might think that it's only for girls and not women). 

I've already passed out information to everyone I could think of here in Cardiff over the last couple of days: I hope you get dozens of replies.
Merge pull request #1 from evildmp/gh-pages

Update launch.md