Incoming support requests needs consolidating

Right now, we can get support requests through WordPress.org forums, the support@hmn.md email address, our personal hmn.md email addresses and intercom.io

I'd like to consolidate everything to intercom in the future:

- [ ] Change email address in plugin to the Intercom App email address `xxxx@incoming.intercom.io`

- [ ] Set up the forum alerts to send an email to that address?

- [ ] stop giving our personal email addresses for support?