refactor(ui): add security rel to external links and cleanup CSS

Author: xihale

assets/index.css

@@ -482,11 +482,6 @@ nav a:hover {
   width: 100%;
 }
 
-.pagefind-ui, 
-.pagefind-ui *,
-.pagefind-ui *::before,
-.pagefind-ui *::after {
-}
 
 #search .pagefind-ui, 
 #search .pagefind-ui *,

assets/style.css

@@ -71,16 +71,17 @@
           <a
             href="http://ask.ziglang.cc"
             target="_blank"
+            rel="noopener noreferrer"
           >
             <img src="$site.asset('icons/github.svg').link()" alt="GitHub">
           </a>
-          <a href="http://ask.ziglang.cc/discord" target="_blank">
+          <a href="http://ask.ziglang.cc/discord" target="_blank" rel="noopener noreferrer">
             <img src="$site.asset('icons/discord.svg').link()" alt="Discord">
           </a>
-          <a href="http://ask.ziglang.cc/telegram" target="_blank">
+          <a href="http://ask.ziglang.cc/telegram" target="_blank" rel="noopener noreferrer">
             <img src="$site.asset('icons/telegram.svg').link()" alt="Telegram">
           </a>
-          <a href="mailto:hello@ziglang.cc" target="_blank">
+          <a href="mailto:hello@ziglang.cc" target="_blank" rel="noopener noreferrer">
             <img src="$site.asset('icons/email.svg').link()" alt="Email">
           </a>
         </div>