chore: Move editor into codebase (#2930)

shared/editor/plugins/SmartText.ts

@@ -0,0 +1,14 @@
+import { ellipsis, smartQuotes, InputRule } from "prosemirror-inputrules";
+import Extension from "../lib/Extension";
+
+const rightArrow = new InputRule(/->$/, "→");
+
+export default class SmartText extends Extension {
+  get name() {
+    return "smart_text";
+  }
+
+  inputRules() {
+    return [rightArrow, ellipsis, ...smartQuotes];
+  }
+}