Revert "scroll-behavior: smooth; (#6206)"

This reverts commit 2feb97e9b9fbd7eef961bc8a28cd712db8c02b6e.
https://github.com/FreshRSS/FreshRSS/pull/6206#issuecomment-2001934192

p/themes/base-theme/frss.css

@@ -53,10 +53,6 @@
 		url('../fonts/OpenSans.woff') format('woff');
 }
 
-html {
-	scroll-behavior: smooth;
-}
-
 html, body {
 	margin: 0;
 	padding: 0;

p/themes/base-theme/frss.rtl.css

@@ -53,10 +53,6 @@
 		url('../fonts/OpenSans.woff') format('woff');
 }
 
-html {
-	scroll-behavior: smooth;
-}
-
 html, body {
 	margin: 0;
 	padding: 0;