Improve scrollbars

Version 2.0 (#19)

- Support for multiple books in one project.
- Design based on [tailwindcss](https://tailwindcss.com/).
- Markdown content is now being loaded with [next-mdx-remote](https://github.com/hashicorp/next-mdx-remote). This means content is now separated from routed pages.
- Auto-centered layout on big resolutions leading to one less configuration option.
- 40% smaller bundle size.
- Navigation bar.
- Updated dependencies.
- Refined mobile UI.
- Less code (−4,000 LOC).

Update docs

Reorganise docs

Update .gitignore

Add accordion example

Merge pull request #9 from amiroff/dark-mode-revamp

Revamp dark mode - no more flicker

Update README.md

Cross-part navigation

Merge pull request #6 from amiroff/tabs

Implement tabbed containers