chore: Move editor into codebase (#2930)

server/editor/renderToHtml.ts

@@ -0,0 +1,29 @@
+import { PluginSimple } from "markdown-it";
+import createMarkdown from "@shared/editor/lib/markdown/rules";
+import breakRule from "@shared/editor/rules/breaks";
+import checkboxRule from "@shared/editor/rules/checkboxes";
+import embedsRule from "@shared/editor/rules/embeds";
+import emojiRule from "@shared/editor/rules/emoji";
+import markRule from "@shared/editor/rules/mark";
+import noticesRule from "@shared/editor/rules/notices";
+import tablesRule from "@shared/editor/rules/tables";
+import underlinesRule from "@shared/editor/rules/underlines";
+
+const defaultRules = [
+  embedsRule([]),
+  breakRule,
+  checkboxRule,
+  markRule({ delim: "==", mark: "highlight" }),
+  markRule({ delim: "!!", mark: "placeholder" }),
+  underlinesRule,
+  tablesRule,
+  noticesRule,
+  emojiRule,
+];
+
+export default function renderToHtml(
+  markdown: string,
+  rulePlugins: PluginSimple[] = defaultRules
+): string {
+  return createMarkdown({ plugins: rulePlugins }).render(markdown).trim();
+}