feat: Individual page export in Markdown and HTML formats (#80)

* fix maths node

* render default html width

* Add page export module
* with support for html and markdown exports

* Page export UI
* Add PDF print too

* remove unused import

apps/server/src/integrations/export/utils.ts

@@ -0,0 +1,12 @@
+import { ExportFormat } from './dto/export-dto';
+
+export function getExportExtension(format: string) {
+  if (format === ExportFormat.HTML) {
+    return '.html';
+  }
+
+  if (format === ExportFormat.Markdown) {
+    return '.md';
+  }
+  return;
+}