added "contribute to codebase" and "download k8s" buttons to the footer

hide left nav area in docs if no nav is present
update text link styles for better readability

_sass/_base.sass

@@ -389,6 +389,14 @@ footer
 		display: block
 		height: 0
 		overflow: hidden
+		
+	&.button
+		background-image: none
+		width: auto
+		height: auto
+		
+		&:hover
+			color: $blue
 
 a.twitter
 	background-position: 0 0
@@ -874,8 +882,19 @@ dd
 	img
 		max-width: 100%
 
+	a
+		font-weight: 700
+		text-decoration: underline
+
+	a:visited
+		color: blueviolet
+
 	a.button
 		border-radius: 2px
+		text-decoration: none
+		
+		&:visited
+			color: white
 
 	a.issue
 		margin-left: 20px

_sass/_reset.sass

@@ -15,7 +15,7 @@ ul, li
 ul
 	margin: 0
 	padding: 0
-
+	
 a
 	text-decoration: none