Remove Roboto font face

[georgewrmarshall]

Description

This task involves the removal of the Roboto font from the MetaMask design tokens repository. Roboto is no longer needed and should be removed from all relevant files, including CSS, CSS-in-JS, and any Figma JSON files where it might appear. This change is expected to be a breaking change and should be included in the next major release.

Technical Details

• Remove all instances of Roboto from the design tokens repository, including:
  • CSS files
  • CSS-in-JS files
  • Figma JSON files
• Update the font stack to ensure Euclid Circular B is used as the primary font, with system fonts as the fallback.
• Ensure that any documentation referencing Roboto is updated to reflect these changes.

Acceptance Criteria

• Roboto is completely removed from the design tokens repository.
• The removal is classified as a breaking change and included in the next major release.
• The font stack is updated to use Euclid Circular B with system fonts as fallbacks.
• All relevant files and documentation are updated accordingly.

References

• Slack conversation regarding the removal of Roboto.
• Related issues and PRs where Roboto has been discussed or previously modified.