Updated production domain.
Update event list copy.

https://github.com/madewithbytes/us_ignite/issues/238
Update organizations copy.

https://github.com/madewithbytes/us_ignite/issues/244
Add challenges to the communities navigation.
Add organizations to the communities menu.

https://github.com/madewithbytes/us_ignite/issues/295
Link learn get involved from the main section.
Update learn title.
Separate learn-developers in get involved section.

https://github.com/madewithbytes/us_ignite/issues/279
Align left welcome email.

https://github.com/madewithbytes/us_ignite/issues/269
Add new user prompt to login screen.

https://github.com/madewithbytes/us_ignite/issues/270
Update copy for welcome invitation email.

https://github.com/madewithbytes/us_ignite/issues/60