#6096639 Reskinned Launch: Update UI/UX with small visual tweaks

Changes proposed in this Pull Request

• Heading & Subheading are aligned to the left (4a0c231).
• Update discounted currency color (0bd3206).
• Update launch page subheader text (16f91e2).
• Align steps counter with actual number of steps (d29dd7c).

For translators

See #53993 (comment)

Pick one that’s right for you and unlock features that help you grow. Or {{link}}continue with a free site{{/link}}.
Choose a plan or {{link}}continue with a free site{{/link}}.

The user has 2 choices:

1. Select one of the plans in the overview or.
2. Continue with a free-tier plan and skip the plan selection.

Testing instructions

1. Check out this branch
2. yarn && yarn start
3. Navigate to /start/launch-site/domains-launch?siteSlug={{SITE_SLUG}}&flags=signup/reskin
4. Switch to a mobile viewport with dev tools.
5. Ensure that:
   • The title & subtitle are left-aligned
   • The step counter shows 2 steps instead of 3.
6. Skip the domain purchase by picking the free domain.
7. Ensure that on the plans page:
   • The subheader text is “Choose a plan or {{link}}continue with a free site{{/link}}”.
8. Switch to a desktop viewport with dev tools.
9. Navigate to /start/launch-site/plans-launch?siteSlug={{SITE_SLUG}}&flags=signup/reskin
10. Ensure that on the plans page:
    • The subheader text is “Pick one that’s right for you and unlock features that help you grow. Or {{link}}continue with a free site{{/link}}”.
11. Continue to launch your site and ensure that:
    • No step counter is displayed on the reskinned processing screen.

Testing the discounted currency color

For elaborate instructions on proxying to other countries, go to PCYsg-qMt-p2.

1. Proxy to India (BOM)
2. Navigate to /start/launch-site/plans-launch?siteSlug={{SITE_SLUG}}&flags=signup/reskin
3. Ensure that:
   • The discounted currency symbol is the same color as the price.

Fixes #53973, fixes #54118