[docs] fix Terminal issue while rendering unmarked lines (#22578)

[docs] add icon to DiffBlock header (#22524)

[docs] cleanup and unify snippet components (#22495)

[docs] fix Step component layout shift due to SSR (#22493)

[docs] address home page snippet layout shift

[docs] partially migrate Snippet component to Tailwind (#21864)

# Why

The plan is roughly to:
1. Migrate snippet from using Emotion entirely to Tailwind.
2. Copy snippet to styleguide repo.
3.

[docs] partially migrate Snippet component to Tailwind (#21864)

# Why

The plan is roughly to:
1. Migrate snippet from using Emotion entirely to Tailwind.
2. Copy snippet to styleguide repo.
3. Switch to using snippet from styleguide.
4. Remove local snippet implementation.

We are in step 1.

# How

By rewriting class after class from Emotion to Styleguide.

There are some classes left but this brings us one step closer to
finishing point 1.

I change I made: instead of 42px I used 40px to just use a TW class and
skip adding too much custom styles. The difference is probably
unnoticeable if you don't know what to look for, but of course it's an
unplanned change so we might not want it. Let me know what you think.

# Test Plan

Visit snippets in docs and make sure that I didn't break anything.

# Checklist

<!--
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] migrate to new styleguide packages (#21557)