[Glitch] Converted app/javascript/flavours/glitch/utils/ folder to TypeScript

Port 1142f4c79e to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/utils/html.ts

@@ -0,0 +1,9 @@
+// NB: This function can still return unsafe HTML
+export const unescapeHTML = (html: string) => {
+  const wrapper = document.createElement('div');
+  wrapper.innerHTML = html
+    .replace(/<br\s*\/?>/g, '\n')
+    .replace(/<\/p><p>/g, '\n\n')
+    .replace(/<[^>]*>/g, '');
+  return wrapper.textContent;
+};