Better base `ul` and `ol` styles

Turns out we were nixing the default browser spacing for bullets and
numbers, so this reverts that and instead just twerks the top/bottom
`margin`.

docs/assets/css/bootstrap.css

@@ -504,8 +504,8 @@ h4 small,
 
 ul,
 ol {
-  padding: 0;
-  margin: 0 0 10px 25px;
+  margin-top: 0;
+  margin-bottom: 10px;
 }
 
 ul ul,

less/type.less

@@ -106,8 +106,8 @@ h4 small, .h4 small { font-size: @font-size-base; }
 // Unordered and Ordered lists
 ul,
 ol {
-  padding: 0;
-  margin: 0 0 (@line-height-computed / 2) 25px;
+  margin-top: 0;
+  margin-bottom: (@line-height-computed / 2);
 }
 ul ul,
 ul ol,