feat: Fix header color, and add a link to the home

src/_layouts/base.html

@@ -30,9 +30,9 @@ SPDX-License-Identifier: EUPL-1.2
     <div class="hero-head">
       <div class="navbar is-primary">
         <div class="navbar-brand">
-          <div class="navbar-item">
+          <a href="/" class="navbar-item">
             <img src="/_uploads/images/dgnum.svg" alt="Logo DGNum sans texte" />
-          </div>
+          </a>
           <a role="button" class="navbar-burger has-text-dark" data-target="navbar-menu" aria-label="menu"
             aria-expanded="false">
             <span aria-hidden="true"></span>

src/assets/scss/dgnum.scss

@@ -25,7 +25,7 @@ a.navbar-item {
 
 .header-anchor {
   font-weight: 600;
-  color: rgb(46, 46, 46);
+  color: var(--bulma-body-color);
   transition: none;
 
   &:not(:hover) {