[REF] website: remove useless edit mode css rule

Part of https://github.com/odoo/odoo/pull/44500



closes odoo/odoo#44500

Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

addons/website/static/src/scss/website.wysiwyg.scss

@@ -143,19 +143,3 @@ html[lang] > body.editor_enable [data-oe-translation-state] {
         }
     }
 }
-
-// ANIMATIONS
-@keyframes fadeInOut {
-    0% {
-        opacity: 0;
-    }
-    25% {
-        opacity: 1;
-    }
-    75% {
-        opacity: 1;
-    }
-    100% {
-        opacity: 0;
-    }
-}