javascriptguide: turn down old ES5 guide

We kept this around for posterity, but all things die eventually.
ES6 was released over a decade ago and there's really no reason to
write new code targeting ES5 or older.  If you actually need to
target such a system, transpilers like Babel are the way to go.
Removing this guide allows us to remove the styleguide.css file as
no other guide relies on it.

404.html

@@ -15,7 +15,8 @@ window.onload = function() {
     'cppguide.xml': 'cppguide.html',
     'google-r-style.html': 'Rguide.html',
     'htmlcssguide.xml': 'htmlcssguide.html',
-    'javascriptguide.xml': 'javascriptguide.html',
+    'javascriptguide.xml': 'jsguide.html',
+    'javascriptguide.html': 'jsguide.html',
     'jsoncstyleguide.html': 'jsoncguide.html',
     'jsoncstyleguide.xml': 'jsoncguide.html',
     'lispguide.xml': 'lispguide.html',

styleguide.css

@@ -1,164 +0,0 @@
-body {
-  background-color: #fff;
-  color: #333;
-  font-family: sans-serif;
-  font-size: 10pt;
-  margin-right: 100px;
-  margin-left: 100px;
-}
-
-h1,
-h2,
-h3,
-h4,
-h5,
-h6,
-.toc_title {
-  color: #06c;
-  margin-top: 2em;
-  margin-bottom: 1em;
-}
-
-h1 {
-  text-align: center;
-  font-size: 18pt;
-}
-
-h2,
-.toc_title {
-  font-weight: bold;
-  font-size: 12pt;
-  margin-left: -40px;
-}
-
-h3,
-h4,
-h5,
-h6 {
-  font-size: 10pt;
-  margin-left: -20px;
-}
-
-.toc_category,
-.toc_stylepoint {
-  font-size: 10pt;
-  padding-top: 0.3em;
-  padding-bottom: 0.3em;
-}
-
-table {
-  border-collapse: collapse;
-}
-
-td,
-th {
-  border: 1px solid #ccc;
-  padding: 2px 12px;
-  font-size: 10pt;
-}
-
-.toc td,
-.toc th {
-  border-width: 1px 5px;
-}
-
-code,
-samp,
-var {
-  color: #060;
-}
-
-pre {
-  position: relative;
-  font-size: 10pt;
-  display: block;
-  color: #060;
-  background-color: #f8fff8;
-  border: 1px solid #f0fff0;
-  border-left-width: 5px;
-  padding: 4px 12px;
-}
-
-pre:before {
-  position: absolute;
-  top: 4px;
-  right: 4px;
-  z-index: 1;
-  content: "GOOD CODE";
-}
-
-pre.badcode {
-  color: #c00;
-  background-color: #fff8f8;
-  border-color: #fff0f0;
-}
-
-pre.badcode:before {
-  content: "BAD CODE";
-}
-
-.showhide_button {
-  float: left;
-  cursor: pointer;
-  border: 1px solid;
-  border-color: #ddd #aaa #aaa #ddd;
-  padding: 0 3px 1px;
-  margin: 0 4px 8px 0;
-  border-radius: 3px;
-  -webkit-border-radius: 3px;
-  -moz-border-radius: 3px;
-}
-
-.link_button {
-  float: left;
-  display: none;
-  background-color: #f8f8ff;
-  border: 1px solid #f0f0ff;
-  font-size: 75%;
-  margin-top: 0;
-  margin-left: -50px;
-  padding: 4px;
-  border-radius: 3px;
-  -webkit-border-radius: 3px;
-  -moz-border-radius: 3px;
-}
-
-address {
-  text-align: right;
-}
-
-hr {
-  margin-top: 3.5em;
-  border-width: 1px;
-  color: #fff;
-}
-
-.stylepoint_section {
-  display: block;
-  margin-bottom: 1em;
-  color: #58f;
-  font-family: sans-serif;
-  font-size: 90%;
-  font-weight: bold;
-  margin-left: -2%;
-}
-
-.stylepoint_subsection {
-  color: #679;
-  font-family: sans-serif;
-  font-size: 90%;
-  font-weight: bold;
-  margin-left: -1%;
-}
-
-.stylepoint_subsubsection {
-  color: #679;
-  font-family: sans-serif;
-  font-size: 80%;
-  font-weight: bold;
-  margin-left: 0;
-}
-
-.revision {
-  text-align: right;
-}