Updated About Us and Terms of Service Page

The content on About Us is suggested by me but is still open for suggestions. 

Also updated terms of service page.

Would like to bug @yangshun to help me review as well - thanks!
Need a backup font in case `lato` fails to load. Refer to the other `font-family` styles in the stylesheet and copy what it uses. At the very least, you want the backup to be sans-serif:
```
font-family: 'Lato', sans-serif;
```