changes: Add 'Changes' section to track changes since previous versions of the spec

This commit also includes updated HTML CSS.

Change-Id: I0f45e3fba25587f97cbb63332d457baacb515f40
diff --git a/named_data_theme/static/base.css_t b/named_data_theme/static/base.css_t
index 93fa4e1..eed3973 100644
--- a/named_data_theme/static/base.css_t
+++ b/named_data_theme/static/base.css_t
@@ -17,7 +17,7 @@
 /* Page layout */
 
 div.header, div.content, div.footer {
-  width: {{ theme_pagewidth }};
+  width: 90%;
   margin-left: auto;
   margin-right: auto;
 }
@@ -159,13 +159,13 @@
 }
 
 div.document {
-  width: {{ theme_documentwidth }};
+  width: 70%;
   float: left;
 }
 
 div.body {
   padding-right: 2em;
-  text-align: {{ theme_textalign }};
+  text-align: left;
 }
 
 div.document h1 {
@@ -173,7 +173,7 @@
 }
 
 div.document ul {
-  margin: 1.5em;
+  margin-left: 1.5em;
   list-style-type: square;
 }
 
@@ -224,10 +224,6 @@
   padding: 0px;
 }
 
-div.document blockquote {
-  margin: 1em;
-}
-
 div.document ol {
   margin: 1.5em;
 }
@@ -236,7 +232,7 @@
 /* Sidebar */
 
 div.sidebar {
-  width: {{ theme_sidebarwidth }};
+  width: 20%;
   float: right;
   font-size: .9em;
 }
@@ -453,3 +449,11 @@
     border-top: 1px solid #ac9;
     border-bottom: 1px solid #ac9;
 }
+
+td.linenos pre {
+    padding: 5px 0px;
+    border: 0;
+    background-color: transparent;
+    color: #aaa;
+    margin-top: -10pt;
+}
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