feat: Domain syntax highlighting

[wodeni]

Description

Related issue/PR: #659

@penrose/panels doesn't highlight Domain programs. This PR adds language configuration for the Domain language.

Implementation strategy and design decisions

• Separate languageConfigs into individual modules and add DomainConfig.
• Fix small issue with errors related to @brackets

Examples with steps to reproduce them

Run yarn start:ide at the top-level and write a Domain program!

Open questions

• I noticed the Style config hard code a lot of things. Perhaps we can export the keywords, type annotations, or even constraint/computation dicts from core to fix this.

[cloudflare-pages]

Deploying with    Cloudflare Pages

Latest commit:	8e75a0d
Status:	✅  Deploy successful!
Preview URL:	https://6cb1e01d.penrose-panes.pages.dev

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[codecov]

Codecov Report

Merging #691 (8e75a0d) into main (e11c4e0) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #691   +/-   ##
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  Coverage   66.78%   66.78%           
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  Files          44       44           
  Lines        7115     7115           
  Branches     1332     1332           
=======================================
  Hits         4752     4752           
  Misses       2354     2354           
  Partials        9        9           

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