[Site design revamp] Adds margin between recommended design title and subtitle

[antonis]

Fixes #

To test:

1. Start the site creation flow
2. Proceed to the site design picker
3. Verify that there is a margin between the recommended title and subtitle

Before	After

Regression Notes

1. Potential unintended areas of impact
   Page layout picker

2. What I did to test those areas of impact (or what existing automated tests I relied on)
   Manual testing

Before	After

6. What automated tests I added (or what prevented me from doing so)
   N/A

PR submission checklist:

• I have completed the Regression Notes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[peril-wordpress-mobile]

	Warnings
⚠️	PR is not assigned to a milestone.

Generated by 🚫 dangerJS

[peril-wordpress-mobile]

You can trigger optional UI/connected tests for these changes by visiting CircleCI here.

[peril-wordpress-mobile]

You can test the changes on this Pull Request by downloading the APKs:

• Jetpack-pr-16692-build-124713.apk

• WordPress-pr-16692-build-124713.apk

[twstokes]

LGTM @antonis! I tested on a Pixel 4a. 🚀