feat: swap in Footer component from @frequency-chain/style-guide

[JoeCap08055]

• also fix tailwindow.config.js to use 'extend' property, else Tailwind classes from the package don't come through always

• Closes #36

Screenshot(s)

Desktop:

Mobile/small screen:

Please delete options that are not relevant.

• [X] Content Change (Required approval in Slack: #frequency-xyz and remember that changes along the way trigger re-approval.)
  • [ ] Approved HE (Required for technical wording)
  • [ ] Approved CM
  • [ ] Approved UO

How to Test?

1. Pull branch
2. Run npm run dev -- --open
3. Visually verify that the footer matches the screenshots

4. Checklist:

• [x] I have performed a self-review of my code
• [x] I have commented my code & PR, particularly in hard-to-understand areas
• [x] I have checked at all the breakpoints to make sure it works on all screen sizes

[github-actions[bot]]

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Preview URL: https://www.frequency.xyz/_pr/43/ Commit: cb89025