Add a manual page

app/main/routes.py

@@ -33,6 +33,11 @@ def dashboard():
     return render_template('main/dashboard.html.j2', title='Dashboard')
 
 
+@bp.route('/user_manual')
+def user_manual():
+    return render_template('main/user_manual.html.j2', title='User manual')
+
+
 @bp.route('/news')
 def news():
     return render_template('main/news.html.j2', title='News')