styles: diminue sensiblement la taille des typographies du site

web/css/layout.css

+html {
+    /* initialement 1.0  */
+    font-size: 0.8rem;
+}
+
+@include media-breakpoint-up(sm) {
+    html {
+        /* initialement 1.2  */
+        font-size: 1.0rem;
+    }
+}
+
+@include media-breakpoint-up(md) {
+    html {
+        /* initialement 1.4  */
+        font-size: 1.2rem;
+    }
+}
+
+@include media-breakpoint-up(lg) {
+    html {
+        /* initialement 1.6  */
+        font-size: 1.4rem;
+    }
+}
\ No newline at end of file

web/css/navmap.css

 nav.navmap {
     position: absolute;
-    top: 14.75em;
+    top: 14.05em;
     left: 50%;
     width: auto;
     margin-left: -55px;

web/css/style.css

 @import url('https://fonts.googleapis.com/css?family=Open+Sans');
 @import url('https://fonts.googleapis.com/css?family=Averia+Sans+Libre:300i,400i');
+@import 'layout.css';
 @import 'tables.css';
 @import 'override.css';
 @import 'navmap.css';