deprecate embedded browser (#12163)

https://github.com/minio/console takes over the functionality for the
future object browser development

Signed-off-by: Harshavardhana <harsha@minio.io>

browser/app/less/inc/buttons.less

@@ -1,57 +0,0 @@
-.btn {
-    border: 0;
-    padding: 5px 10px;
-    font-size: 12px;
-    line-height: 1.5;
-    border-radius: 2px;
-    text-align: center;
-    .transition(all);
-    .transition-duration(300ms);
-
-    &:hover,
-    &:focus {
-        .opacity(0.9);
-    }
-}
-
-/*-----------------------------------
-    Button Variants
-------------------------------------*/
-.btn-variant(@bg-color, @color) {
-    color: @color;
-    background-color: @bg-color;
-
-    &:hover,
-    &:focus {
-        color: @color;
-        background-color: darken(@bg-color, 6%);
-    }
-
-
-}
-
-.btn-block {
-    display: block;
-    width: 100%;
-}
-
-.btn-white {
-    .btn-variant(#fff, darken(@text-color, 20%));
-}
-
-.btn-link {
-    .btn-variant(#eee, #545454);
-}
-
-.btn-danger {
-    .btn-variant(@red, @white);
-}
-
-.btn-primary {
-    .btn-variant(@blue, @white);
-}
-
-.btn-success {
-    .btn-variant(@green, @white);
-}
-//-----------------------------------