Reworked the main header that describes the club

I fixed grammatical mistakes and tried to more accurately describe 
what meetings entail. Further work needs to be done, but perhaps 
that can wait until we get the whole site overhauled.

How does it look now? (I couldn't figure out how to test it with css, so
I hope it looks okay)

Also, sorry I committed right to ```master```. I forgot to make a branch.