Wide page as helper class, disable prod. sourcemaps, reduce header size

Header lineheight reduced slightly

_sass/glitch.scss

@@ -1,6 +1,7 @@
 
 header {
   max-width: 100vw;
+  line-height: 1;
   .stack {
     overflow: hidden;
     display: grid;

_sass/helpers.scss

@@ -22,3 +22,7 @@ p {
     border-width: thin 0;
     padding: 10px;
 }
+
+body.wide {
+    max-width: 60rem !important;
+}