:70ch for GHS article

Width was too little for all the nesting and snippets it had.

style.css

@@ -54,6 +54,11 @@ body.article #content {
 
   line-height: 1.8em;
 }
+/* ~70 for certain articles because of nesting (like GHS) */
+body.article #content {
+  max-width: 44em;  /* fallback for older browsers */
+  max-width: 70ch;
+}
 body article header,
 body.article #header {
   margin: auto;