Update to new theme

[shannonwells]

Goal

The goal of this PR is to make the site look like the rest of the Developer Portal.
To do this, the Style Guide was added so that the custom Tailwind styles and some of the Style Guide components can be used.

I used the Figma docs as a guide for whitespace, font sizes, and media break changes. I tried to make it work at even very small widths, < 400px.

Closes #32

Checklist

• PR Self-Review and Commenting

How To Test the Changes

check on multiple browsers at http://localhost:5173 :

git fetch && git checkout theme-update
cd client
npm run dev

[shannonwells]

Added this to match the frequency.xyz site, however the link to the privacy policy would point to the faucet, not frequency.xyz, so I just copied the code & modified it, then converted the logo SVG to a Svelte component to let you make a resizable, colored one.

[claireolmstead]

Read code & pair programmed & pair reviewed 🚢