refactor: separate the highlight view

[StevenEWright]

fix: undo/redo improper counting
fix: backspace not considered "mutating"
feat: npm run website:dev
fix: input processor docs
feat: re-introduce highlight throttling

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[github-actions]

size-limit report 📦

Path	Size
./dist/kullna-editor.min.js	6.63 KB (+2.73% 🔺)