update theme

Author: tkam8

docs/_static/css/f5_agility_theme.css

@@ -1,9 +1,13 @@
+div[class^='highlight'] pre, div[class~='docutils'], code, .code.descname {
+    background: lightgrey !important;
+}
+
 img {
-	max-width: 100%;
-    height: auto;
+/*	max-width: 100%;
+    height: auto;*/
 	margin-bottom: 12px;
 }
 
 table {
 	margin-bottom: 12px;
-}
+}