Tweak docs styling, add serve-docs script

docs/_layouts/default.html

@@ -113,7 +113,7 @@
     );
   });
 
-  if (document.body.scrollHeight > window.innerHeight) {
+  if (document.body.scrollHeight > window.innerHeight + 500) {
     $(document.body).scrollspy({
       target: '#current-page-table-of-contents',
       offset: 40

docs/assets/css/style.scss

@@ -9,8 +9,7 @@ $sidebar-transition: left 0.25s;
 $container-width: 1024px;
 
 body {
-  overflow-y: scroll;
-  overflow-x: hidden;
+  overflow: scroll;
 }
 
 #container {
@@ -25,6 +24,7 @@ body {
 
 #sidebar {
   position: fixed;
+  background: white;
   top: 0;
   bottom: 0;
   width: $sidebar-width;

script/serve-docs

@@ -0,0 +1,4 @@
+#!/bin/bash
+
+cd docs
+bundle exec jekyll serve