fix: Footer link hover effect is too low contrast

[anablaz]

Closes #8

Changes

• Fix the contrast of the footer link hover effect, add underlining when hovering to be visually and functionally consistent with the footer at https://docs.accordproject.org/
• Add/update Node dependencies

Related Issues

• Issue #8

Author Checklist

• [X] Ensure you provide a DCO sign-off for your commits using the --signoff option of git commit.
• [ ] Vital features and changes captured in unit and/or integration tests
• [X] Commits messages follow AP format
• [ ] Extend the documentation, if necessary
• [X] Merging to master from fork:branchname
• [ ] Manual accessibility test performed
  • [ ] Keyboard-only access, including forms
  • [ ] Contrast at least WCAG Level A
  • [ ] Appropriate labels, alt text, and instructions

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