[Site refactor] Documentation update

[josepmartins]

Summary

This PR updates image examples in the design guidelines regarding the latest Typographic and border radius scale changes. This affects a list of component like Hero, River, CTABanners, etc.

This is part of the documentation update issue: https://github.com/github/primer/issues/2620

List of notable changes:

• updated Label image examples
• updated FAQ image examples
• updated CTABanner image examples
• updated CTAForm image examples
• updated Grid image examples and layout
• updated Heading image examples
• updated River image examples

What should reviewers focus on?

Documentation is updated with latest site refactor designs.

Preview: https://primer-e6cc30237b-26139705.drafts.github.io/components/CTABanner

Supporting resources (related issues, external links, etc):

• https://github.com/github/primer/issues/2620

Contributor checklist:

• All new and existing CI checks pass
• Tests prove that the feature works and covers both happy and unhappy paths
• Any drop in coverage, breaking changes or regressions have been documented above
• New visual snapshots have been generated / updated for any UI changes
• All developer debugging and non-functional logging has been removed
• Related issues have been referenced in the PR description

Reviewer checklist:

• Check that pull request and proposed changes adhere to our contribution guidelines and code of conduct
• Check that tests prove the feature works and covers both happy and unhappy paths
• Check that there aren't other open Pull Requests for the same update/change

Screenshots:

Please try to provide before and after screenshots or videos

Before	After

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Latest commit: a50b8eb

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[github-actions]

🟢 No design token changes found

[github-actions]

⚠️ Visual differences found

Our visual comparison tests found UI differences.

Please review the differences by using the test artifacts to ensure that the changes were intentional.

Artifacts can be downloaded and reviewed locally.

Download links are available at the bottom of the workflow summary screen.

Example:

If the changes are expected, please run npm run test:visual:update-snapshots to replace the previous fixtures.

Review visual differences

[rezrah]

These don't visually appear like headings, which is presumably a theme limitation. Can we make this a h3 instead and bump up each preceding heading?

[josepmartins]

I think I rather adjust the styles in Doctocat than bumping each upper level heading, as this section deserves 3 levels at least 👍

[rezrah]

Looks good, left some feedback / suggestions but pre-emptively approving to help move it along 👍

[auareyou]

Added a couple of comments out of curiosity but everything looks good.