speedup suggestions from Lighthouse

frontend/files/index.html

@@ -6,12 +6,13 @@
       rel="stylesheet"
       href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css"
     />
-    <link rel="stylesheet" href="css/reset.css" />
-    <link rel="stylesheet" href="css/style.css" />
+    <link rel="stylesheet" href="style.css" />
     <link rel="icon" href="favicon.ico" type="image/x-icon" />
     <link
-      href="https://fonts.googleapis.com/css?family=Libre+Baskerville:400,700"
+      href="https://fonts.googleapis.com/css?family=Libre+Baskerville:400,700&display=swap"
       rel="stylesheet"
+      as="font"
+      rel="preload"
     />
     <script type="text/javascript">
       var sortState = {
@@ -220,7 +221,10 @@
     <div class="wrapper">
       <div id="header">
         <h1>Library</h1>
-        <a target="_blank" href="https://git.yetaga.in/alazyreader/library"
+        <a
+          target="_blank"
+          rel="noreferrer"
+          href="https://git.yetaga.in/alazyreader/library"
           >git</a
         >
         <div id="searchBox">