#5525606 Add/anchor gutenboarding signup page

Changes proposed in this Pull Request

• In Anchor-flavored gutenboarding, add a new anchor-specific signup page with anchor marketing text.
• Regular gutenboarding retains its previous signup page.

Testing instructions

(Non-Anchor)

• In a logged out window, visit http://calypso.localhost:3000/new
  • Make it to the end of the process
  • You should see the same “Save your progress” form as before this PR, and it should still be functional
    

(Anchor)

• In a logged out window, visit http://calypso.localhost:3000/new?&anchor_podcast=9fa55c4
  • You should see an anchor specific signup form as the first step
  • It should have anchor marketing text and continue to function, including the “Log in ” link
    

Needs Design Help / Design Review

Compare the screenshot above to the original mockup:

There are still some differences, so any design help would be appreciated. For example:

• I don’t know where to get the icons on the right side.
• The signup form is missing a username box. However, I’m not sure if we want to change the mechanics of the form given our tight deadline here.
• Whitespace / formatting / etc.

Related to 358-gh-Automattic/dotcom-manage