Website redesign and Harper Desktop page

[JasonTheAdams]

Summary

This is a (hopefully) lovely redesign of the Harper website. It includes:

• A new home page
• A new "Get Harper" page — to help folks learn all the neat ways to use Harper
• A new Harper Desktop page — in preparation for the launch of Harper Desktop beta

Tests

• pnpm check
• just build-web

Visuals

Home Page

Get Harper page

Harper Desktop Page

[elijah-potter]

I went ahead and did some refactoring. Nothing major, but things that will make it easier for us to move away from SveltePress in the future. Notably:

• Swapped over to Tailwind for basically everything, adding dark mode support in the process.
• Turned potentially reusable chunks of pages into components.
• Where relevant, refactored existing components to use the existing style.

There were also a few visual problems that didn't show up at first glance when we were reviewing it together (like icons that weren't centered). I went and fixed those as well. It should be good to go.

[JasonTheAdams]

Love it! Thanks for all the tweaks! 🙌

[elijah-potter]

I'm going to hold off on merging this though. I hope to run a release with Desktop today, making it available to install. From there, I'll add the download link to the relevant page in this PR and merge it.