Heading redesign

[GomezIvann]

Checklist

• The build process is done without errors. All tests pass in the /lib directory.
• Self-reviewed the code before submitting.
• Meets accessibility standards.
• Added/updated documentation to /website as needed.
• Added/updated tests as needed.

Description
Redesign of the heading component following the new design kit specifications, already using the new token architecture (CSS variables). Some changes have been made to the component:

• New heading level: h6 and 6.

Breaking changes

• The prop weight values have changed: 'default' | 'regular' | 'light'.

Additional context
Figma designs

[Copilot]

Pull Request Overview

This PR implements a redesign of the heading component to align with the new design kit specifications and token architecture. Key changes include:

• Removal of the explicit "bold" weight from DxcHeading instances across multiple pages.
• Updated heading level handling to support level 6 where applicable.
• Adjustments to code examples and documentation to reflect the new heading API.

Reviewed Changes

Copilot reviewed 39 out of 39 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
apps/website/screens/principles/iconography/IconographyPage.tsx	Removed the explicit bold weight from the Iconography heading.
apps/website/screens/principles/data-visualization/DataVisualizationPage.tsx	Removed the bold weight from the Data visualization heading.
apps/website/screens/principles/color/ColorPage.tsx	Removed the bold weight from the Color heading.
apps/website/screens/overview/releases/ReleasesPage.tsx	Removed the bold weight from the Releases heading.
apps/website/screens/overview/introduction/IntroductionPage.tsx	Removed the bold weight from the Introduction heading.
apps/website/screens/overview/installation/InstallationPage.tsx	Removed the bold weight from the Installation heading.
apps/website/screens/overview/component-lifecycle/ComponentLifecyclePage.tsx	Removed the bold weight from the Component lifecycle heading.
apps/website/screens/components/heading/code/examples/basicUsage.ts	Updated code example to illustrate multiple heading levels.
apps/website/screens/components/heading/code/HeadingCodePage.tsx	Updated the prop documentation for "level", "as", "margin", and "weight" to include support for level 6 and revised allowed values.
apps/website/screens/components/heading/HeadingPageLayout.tsx	Revised heading description to be more concise and consistent with the new design.
apps/website/screens/common/HeadingLink.tsx	Removed the explicit bold weight from the heading rendered within the link component.
apps/website/screens/common/ComponentHeading.tsx	Removed the explicit bold weight from the component heading in favor of the new default styling.
apps/website/pages/components/heading/index.tsx	Updated to use the new HeadingOverviewPage instead of the previous code/spec pages.

Comments suppressed due to low confidence (1)

apps/website/screens/common/ComponentHeading.tsx:7

• The explicit 'bold' weight was removed from the ComponentHeading. Verify that the default styling now applied meets the intended design specifications for visual hierarchy.

<DxcHeading level={1} text={name} />