add video and some fixes

server.js

@@ -66,7 +66,7 @@ wss.on("connection", (ws) => {
               const { min, sec } = m.groups;
               const t = `${min}_${sec}`;
               ts.push(t);
-              newContent += `![${line}](/${q_stem}/${t}.webp)\n`;
+              newContent += `![${line}](/images/${q_stem}/${t}.webp)\n`;
               newContent += `${line}\n`;
               newContent += `\n`;
               isChanged = true;
@@ -129,10 +129,6 @@ wss.on("connection", (ws) => {
 function loadMdFile(q) {
   const q_stem = make_q_stem(q);
 
-  try {
-    mkdirSync(joinPath(MD_ROOT_DIR, q_stem));
-  } catch (e) {}
-
   const filename = joinPath(MD_ROOT_DIR, `${q_stem}.md`);
   try {
     // create a blank md file if not exists
@@ -152,5 +148,5 @@ function make_q_stem(q) {
     .replace(/\.[a-z0-9]+$/, "")
     .replace(/\[.+?\]/g, "")
     .trim()
-    .replace(/\s+/g, "_");
+    .replace(/[%\s]+/g, "_");
 }