Add commercial use text to the main page

[jwoods-ucsb]

Explicitly call out that the UCSB GitHub organization is not meant for “commercial use” with a definition for commercial use.

[kevinwucodes]

@jwoods-ucsb , this is done in fec6c42. However, I cannot find a definition of non-commercial use from GitHub. Do you think this definition is needed?

[kevinwucodes]

@jwoods-ucsb I got further clarification from GitHub about the whole non-commercial use. The key question is, "are they a student at UCSB?" If yes, then the service is allowed.

So from that, I'd like to add the following sentence right before the "Features/Benefits" section

If you have graduated from UC Santa Barbara, you cannot have access to the UC Santa Barbara GitHub organization.

What are your thoughts on this?

[jwoods-ucsb]

@kevinwucodes

I would agree with that text added to the guide