let BS4 control font-size

WIP #2

basetheme_bootstrap/static/css/basetheme_bootstrap4_pasteur.css

 .content-page-title .btn,
 html {
-    font: 1em "Brandon","Arial","Helvetica",sans-serif;
-    color: #414144;
+    font-family: "Brandon","Arial","Helvetica",sans-serif;
 }
 .fork_me{
     font-family: tahoma;