feat(global) several major updates:

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

frontend/app/blog/layout.tsx

@@ -6,9 +6,10 @@ function Layout({
     children: React.ReactNode;
 }) {
     return (
-        // <div className={ 'flex flex-auto p-7 pl-2 md:pl-7 items-stretch justify-center' }>
         <div className={ 'flex flex-auto p-7 pl-2 lg:pl-7 w-full justify-center' }>
-            { children }
+            <main className={ 'w-full' }>
+                { children }
+            </main>
         </div>
     );
 }