add videos, update dedup and lazy load image

server.js

@@ -64,7 +64,9 @@ wss.on("connection", (ws) => {
               const { min, sec } = m.groups;
               const t = `${min}_${sec}`;
               ts.push(t);
-              newContent += `\n![${line}](./${q_stem}/${t}.png)\n\n`;
+              newContent += `![${line}](./${q_stem}/${t}.png)\n`;
+              newContent += `${line}\n`;
+              newContent += `\n`;
               isChanged = true;
             } else {
               newContent += `${line}\n`;