Omit config.action_mailer.default_url_options in next release of Rails

[stevepolitodesign]

Once rails/rails#51191 is in the next Rails release, we can omit the following line:

jumpstart/template.rb

Line 79 in edfcc4b

environment "config.action_mailer.default_url_options = { host: 'localhost', port: 3000 }", env: 'development'

[stevepolitodesign]

@excid3 feel free to close this or move this to a backlog. I just wanted to bring it to your attention 👍

[excid3]

Great improvement @stevepolitodesign 👍

[excid3]

Going to close this for now since we'll still need this line for older Rails version unless we drop support for them at some point.