Remove unused .btn and .btn-default definitions

css/grayscale.scss

@@ -216,29 +216,6 @@ a {
     }
 }
 
-.btn {
-    text-transform: uppercase;
-    font-family: "Montserrat","Helvetica Neue",Helvetica,Arial,sans-serif;
-    font-weight: 400;
-    -webkit-transition: all .3s ease-in-out;
-    -moz-transition: all .3s ease-in-out;
-    transition: all .3s ease-in-out;
-    border-radius: 0;
-}
-
-.btn-default {
-    border: 1px solid $primary;
-    color: $primary;
-    background-color: transparent;
-    &:hover,
-    &:focus {
-        border: 1px solid $primary;
-        outline: none;
-        color: black;
-        background-color: $primary;
-    }
-}
-
 /* Added in { Personal } */
 ul.social-buttons li a {
   display: block;