[docs] a11y: customize focus appearance, ensure visibility (#23093)

[docs] fix SidebarLink layout shift issue (#22566)

[docs] tweak sidebar activity indicator and spacing (#22288)

[docs] update Next and Styleguide packages to the latest version (#22274)

[docs] reorganize navigation structure, introduce Home route (#22011)

Co-authored-by: Simek <[email protected]>

[docs] migrate to new styleguide packages (#21557)

[docs] Add radix colors (#20397)

# Why

I updated the styleguide to use Radix colors. This PR adds the new
version of styleguide to the docs and changes all the color, shadow, and
border-radius

[docs] Add radix colors (#20397)

# Why

I updated the styleguide to use Radix colors. This PR adds the new
version of styleguide to the docs and changes all the color, shadow, and
border-radius values.

# How

- Very carefully finding + replacing values.
- Also used `tsc` to find spots where I missed.

# Test Plan

I looked through the docs for awhile and fixed up a lot of spots that
did not look correct. However, there may be more spots out there, so
please click through the website and report any color issues that appear
in this PR and not in production.

# Checklist

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Please check the appropriate items below if they apply to your diff.
This is required for changes to Expo modules.
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- [x] Documentation is up to date to reflect these changes (eg:
https://docs.expo.dev and README.md).
- [x] Conforms with the [Documentation Writing Style
Guide](https://github.com/expo/expo/blob/main/guides/Expo%20Documentation%20Writing%20Style%20Guide.md)
- [x] This diff will work correctly for `expo prebuild` & EAS Build (eg:
updated a module plugin).

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[docs] switch to the new font system introduced in Next 13 (#20536)

[docs] cleanup website common files (#20455)

[docs] remove React Native docs and docs submodule (#19287)

Co-authored-by: Brent Vatne <[email protected]>

[docs] update to Next 13, refactor links (#19698)

[docs] ensure that active sidebar link is always in viewport (#19193)

[docs] refactor navigation UI, switch to new Header (#18423)