Cleanup cruft, update jsxstyle to latest canary

[meyer]

Problem

jsxstyle was out of date and there was some stuff I forgot to delete in useMonacoEditor.

Solution

update jsxstyle, clean up unused code

Result

✨clean✨

[coveralls]

Pull Request Test Coverage Report for Build 5358377593

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 61.089%

---

Totals
Change from base Build 5310636891:	0.0%
Covered Lines:	15801
Relevant Lines:	24117

---

💛 - Coveralls