Revert "Basic support for buttons in overview panel."

This reverts commit c76e73489ac989dc0e90f65312b737831850af96.

services/web/public/stylesheets/app/editor/review-panel.less

@@ -218,7 +218,6 @@
 		padding: 2px 5px;
 		border-bottom: solid 1px @rp-border-grey;
 		cursor: pointer;
-		position: relative;
 	}
 
 	border-left: solid @rp-entry-ribbon-width transparent;
@@ -316,15 +315,6 @@
 		.rp-state-overview & {
 			display: none;
 		}
-
-		.rp-state-overview .rp-entry:hover & {
-			display: flex;
-			position: absolute;
-			right: 0;
-			top: 0;
-			bottom: 0;
-			opacity: 0.9;
-		}
 	}
 		.rp-entry-button {
 			.rp-button();
@@ -336,13 +326,6 @@
 				border-bottom-right-radius: 3px;
 				border-right-width: 0;
 			}
-
-			.rp-state-overview & {
-				display: flex;
-				flex-direction: column;
-				padding: 5px;
-				border-radius: 0;
-			}
 		}
 
 	.rp-comment {