refactor: Add <CodeBlock /> component

[bryphe-coder]

This ports over a component from v1 that is needed for the v2 workspace page, and adds theme colors for it:

Component in storybook:

By bringing in these components ahead of time - it'll make the workspaces page PR smaller.

[codecov]

Codecov Report

Merging #168 (23ac375) into main (f19770b) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #168      +/-   ##
==========================================
- Coverage   65.44%   65.42%   -0.03%     
==========================================
  Files         106      107       +1     
  Lines        5580     5588       +8     
  Branches       68       68              
==========================================
+ Hits         3652     3656       +4     
- Misses       1572     1576       +4     
  Partials      356      356              

Flag	Coverage Δ
unittest-go-macos-latest	62.51% <ø> (-0.22%)	⬇️
unittest-go-ubuntu-latest	63.92% <ø> (-0.43%)	⬇️
unittest-go-windows-latest	61.77% <ø> (-0.55%)	⬇️
unittest-js	64.66% <100.00%> (+0.44%)	⬆️

Impacted Files	Coverage Δ
site/theme/palettes.ts	100.00% <ø> (ø)
site/components/CodeBlock/index.tsx	100.00% <100.00%> (ø)
peerbroker/dial.go	76.19% <0.00%> (-4.77%)	⬇️
peer/conn.go	77.17% <0.00%> (-0.77%)	⬇️
coderd/provisionerdaemons.go	47.80% <0.00%> (+0.59%)	⬆️

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[kylecarbs]

Nice nice