[stringtemplate-interest] new documentation

[Terence Parr]

Howdy. It'sTime to think about the documentation for 4.0.   Graham Wideman did a great job of updating the old documentation to make it easier to understand. I think we should completely start over and copy the bits from the old documentation. since were starting from scratch, now's the time to give me ideas about what you liked and didn't like about the old documentation :)

Ter