Lets have a root path as a logo link

it looks nice :-)

Signed-off-by: Artem Sidorenko <artem@posteo.de>

Author: artem-sidorenko

themes/devsec/layouts/partials/header.html

@@ -2,7 +2,7 @@
   <ul class="title-area">
     <li class="name">
       <h1>
-        <a href="/index.html" id="nav-logo">
+        <a href="/" id="nav-logo">
           <img src="/images/hardening_logo.png" style="width: 45px;"/>
           DevSec Hardening Framework
         </a>