[TASK] Remove light-bg class from templates

This is done to leave the background color and content margin handling fully in the extension user's hands.

Resources/Private/Templates/ListByCategory/Index.html

@@ -22,13 +22,13 @@
 		</script>
 	</f:alias>
 
-	<section class="content light-bg">
+	<section class="content">
 		<div class="container">
 			<f:for each="{categories}" as="category">
 				<div class="tx-sgnews-category-wrapper" data-category="{category.subtitleWithFallbackToTitle}">
 					<h2 class="tx-sgnews-category-title">{category.subtitleWithFallbackToTitle}</h2>
 
-					<section class="content light-bg">
+					<section class="content">
 						<div class="container tx-sgnews-categories">
 							<ul class="tx-sgnews-list tx-sgnews-list-0 row" data-record="0">
 								<f:for each="{newsMetaData}" as="newsMetaDataEntry">

Resources/Private/Templates/SingleView/SingleView.html

@@ -112,7 +112,7 @@
 		</section>
 
 	</div>
-	<section class="content light-bg ">
+	<section class="content">
 		<div class="container">
 			<div class="tx-sgnews-single">
 				<div class="tx-sgnews-single-container">
@@ -192,7 +192,7 @@
 		</div>
 	</section>
 
-	<section class="content light-bg">
+	<section class="content">
 		<div class="container">
 			<div class="tx-sgnews-single-comments">
 				<div id="comments" class="tx-sgnews-comments-inner">