New Theme: Form submission confirmation looks weird.

[StevenDufresne]

Description

After submitting the contact form, I get this:

Expectations

• The headings should be bold, not the content
• No need for a "go back" button
• "Your message was sent" should receive a different visual treatment.
  • Maybe use our notice component if possible
• There are ":" after "?" which looks broken.

[outdoor2kode]

The contact form success message should be able to be adjusted via this hook. Did some tests, and it doesn't work locally. Move to the post-launch.