Update dependencies

[Jeremy-Walton]

Why?

Several dependencies were out of date and has vulnerability warnings.

What Changed

• Update all dependencies
• Update import paths to explicitly reference the index files
• Fix table of contents
• Add favicon for documentation site

Quality Assurance

• Have you tagged the PR with the correct labels?
• Have you validated the changes?
  • Have you run linters? (yarn sanity-check)
  • Have you run prettier?
  • Have you tried building the css?
  • Have you tried building storybook?
• [ ] Have you updated any usage of changed tokens?
• ~~[ ] Did you add a component?~`
  • ~~[ ] Have you added it to the dependency graph?``
  • [ ] Have you added it to the docs?
• [ ] Did you update a component?
  • [ ] Have you updated the dependency graph?
  • [ ] Have you updated the docs?
• [ ] Do you need to update the package version?
  • [ ] Did you update the example pages in .storybook/assets?
• Were any changes made to the top level optics.css file?
  • Were those changes reflected in the other top level files?