feat(global) several major updates:

- delete page `tag`, `archive`
- add page `friends`
- implement page `about` *partially*

frontend/app/blog/post/[id]/page.tsx

@@ -1,6 +1,7 @@
 import React from 'react';
 import PostCard from '@/app/blog/post/[id]/PostCard';
 import { MotionDiv } from '@/app/public/MotionDiv';
+import ButtonGoBack from '@/app/blog/post/[id]/ButtonGoBack';
 
 function BlogReader({ params }: { params: { id: string } }) {
 
@@ -14,6 +15,9 @@ function BlogReader({ params }: { params: { id: string } }) {
             <div className={ `max-w-full` }>
                 <PostCard id={ params.id } />
             </div>
+            <div className={ 'mt-3' }>
+                <ButtonGoBack />
+            </div>
         </MotionDiv>
     );
 }