ensure first child div of #sidebar has zero top padding (DLC-1129)

- remove .inner borders in signature layout

Author: barmintor

app/assets/stylesheets/stylesheets/_base_layout.scss

@@ -671,6 +671,9 @@ h2[itemprop="name"] {
 }
 #sidebar {
 	clear: both;
+	div:first-of-type {
+		padding-top: 0;
+	}
 	.card {
 		border-color: map-get($theme-border-colors, 'secondary');
 		border-style: solid;

app/assets/stylesheets/stylesheets/signature/_main_container.scss

@@ -3,7 +3,6 @@
 	background-color: $body-bg;
 	.inner {
 		padding: 1em;
-		border: 1px solid map-get($theme-border-colors, 'body');
 		&.home {
 			padding: 0;
 			border: 0;