Add link to https://hostea.org

So that the user can conveniently go back to hostea.org without
editing with the URL manually.

Signed-off-by: Loïc Dachary <loic@dachary.org>

dash/templates/dash/common/components/primary-nav.html

@@ -2,10 +2,10 @@
 <nav class="nav__container">
   <input type="checkbox" class="nav__toggle" id="nav__toggle" />
   <div class="nav__header">
-    <a class="nav__logo-container" href="/">
+    <a class="nav__logo-container" href="https://hostea.org">
       <img
         src="{% static 'img/android-icon-48x48.png' %}"
-        alt="Hostea temporary logo"
+        alt="Hostea logo"
       />
       <p class="nav__home-btn">ostea</p>
     </a>