small edits

[tchoi8]

1. 'About' page instead of 'Mission'
   Maybe we can include About(founders) content and merge with mission
   founders content is here
   https://github.com/SFPC/sfpc.github.io/blob/f3e9a7e5b4d8e8da317d31f2722ba68516dbfacc/layouts/founders/single.html
2. changes made in github re few details
   a. changed spring session info
   b. making lab
   c. my role- teacher
3. roadmap
   let's aggregate content from spring 2014 by this week and start shaping final form of this website that will live until next fall.

[caseyg]

I feel like these things are pretty well documented in other issues or have been fixed. e.g. clarifying people page #13, ongoing typo fixes Ty has been making, and roll out of Fall call.