Update welcome.email.md

Hi Derek - I re-wrote much of the Welcome email to make it more clear and reflect our current support details. Please compare my changes to the changes you made previously, to get a sense of what I'm looking for in terms of communication. After reviewing one final time, if no errors are found, please push this LIVE asap.
Merge pull request #3 from davidgardner11/patch-2

Update welcome.email.md