Various improvements

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

js/src/utils/html.ts

@@ -1,3 +1,7 @@
 export function nl2br(text: string): string {
   return text.replace(/(?:\r\n|\r|\n)/g, "<br>");
 }
+
+export function flattenHTMLParagraphs(html: string): string {
+  return html.replace("</p><p>", "<br />").replace(/<?\/p>/g, "");
+}