[FIX] website: rtl on frontend when logged out

Before this commit, RTL on frontend was only enabled for connected user.

To have RTL, we add the direction on the element, and the RTL version of
the stylesheet for the applicable languages are generated thanks to rtlcss.

opw-1892757
closes #28434

addons/website/static/src/scss/website.ui.scss

@@ -4,8 +4,12 @@
 ///
 
 // LAYOUTING
-body.o_connected_user {
+body {
+    // Set frontend direction that will be flipped with
+    // rtlcss for right-to-left text direction.
     direction: ltr;
+}
+body.o_connected_user {
     padding-top: $o-navbar-height!important;
 }