fix(docs): improved label/input hover debug

Fix #503

Author: redox

docs/css/_documentation.sass

@@ -346,6 +346,16 @@ code
             outline: 1px solid #ff6600
             &:before
               color: #ff6600
+    label:hover
+      // hovering a label containing a input forwards the `:hover` state to the input
+      // let's hide it except when you focus/activate it
+      input[class^=ais-]:hover
+        &:before
+          display: none
+      input[class^=ais-]:focus, input[class^=ais-]:active
+        &:before
+          display: block
+
 
 @media (max-width: $screen-sm-max)
   .main-documentation