Update nav.html (#1657)

Fixed the links to home page as requested from another user

_includes/nav.html

@@ -1,7 +1,7 @@
 <nav class="fixed-top bg-dark">
   <div id="navbar" class="d-flex flex-wrap justify-content-between align-items-center">
     <div class="w-50">
-      <a id="nav-home-mobile" class="nav-anchor" href="/index.html">
+      <a id="nav-home-mobile" class="nav-anchor" href="/">
         <img src="/assets/img/svg/layout/brand/horizontal.svg" width="150px" />
       </a>
     </div>
@@ -10,7 +10,7 @@
 
     <div class="menu w-100">
       <div id="nav-left" class="position-relative flex-col">
-        <a class="nav-anchor" href="/index.html">
+        <a class="nav-anchor" href="/">
           <span id="nav-home" class="fas fa-home fa-fw"></span>
         </a>