[WIP] Polish writing for clarity in PR

[Copilot]

• Fix grammatical and formatting issues in README.md:
  • Add missing comma after "Using Emscripten"
  • Fix malformed Markdown link ((example)[URL]) → ([example](URL))
  • Fix extra backtick in code fence closing ```` → ```
  • Remove unnecessary backtick formatting around plain English words
• Fix grammatical and writing issues in live/README.md:
  • Fix subject-verb agreement: "support" → "supports"
  • Fix broken phrase "can be used as an for" → "can be used as an alternative to" (also fixed em-dash to hyphen in command)
  • Fix missing apostrophe: "your browsers" → "your browser's"

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.