feat(docs): Fix known issues in the webpage

Author: OasisPioneer

README.md

@@ -57,7 +57,7 @@
 <p align="center">
     强烈推荐您通过在线网站阅读本书，以获得最佳的排版和交互体验。
     <br>
-    <a href="www.demo.com"><strong>➡️ 点击这里开始阅读 ⬅️</strong></a>
+    <a href="https://oasispioneer.com/Modern-CPP-Full-Stack-Tutorial/"><strong>➡️ 点击这里开始阅读 ⬅️</strong></a>
 </p>
 
 <div align="center">

source/_templates/page.html

@@ -10,7 +10,7 @@
         data-repo-id="R_kgDOQ0uvPA"
         data-category="Announcements"
         data-category-id="DIC_kwDOQ0uvPM4C0rb_"
-        data-mapping="title"
+        data-mapping="pathname"
         data-strict="0"
         data-reactions-enabled="1"
         data-emit-metadata="0"