More content and homepage fix

Author: theogf

_layout/nav.html

@@ -1,10 +1,11 @@
 <nav class="navbar navbar-expand-lg navbar-dark bg-dark fixed-top" id="mainNav">
   <div class="container">
     <span class="navbar-brand">
+      <a href="/">
       {{if add_nav_logo}}
         <img src="{{ nav_logo_path }}" class="img-fluid" style="{{ nav_logo_style }}" alt="{{ nav_logo_alt }}"/>
       {{end}}
-      <a href="/">JuliaGPs</a>
+      JuliaGPs</a>
       {{if sub_page}}
       <a href="#page-top"> : {{title}}</a>
       {{end}}

tutorials.md

@@ -4,7 +4,8 @@
 \begin{section}{title="Tutorial list", name="Tutorial list"}
 \lead{You will find here a collection of tutorials involving one or more packages from the JuliaGPs ecosystem.
 
-- [Gaussian Process Regression with hyperparameter optimization](tutorials/gpwithopt)
+**The list is currently empty but content will be added soon**
+<!-- - [Gaussian Process Regression with hyperparameter optimization](tutorials/gpwithopt) -->
 
 }
 \end{section}