[FIX] odoo_theme: add bottom margin to inner lists

closes #7724

X-original-commit: 1200df1
Signed-off-by: Samuel Lieber (sali) <sali@odoo.com>

Author: samueljlieber

extensions/odoo_theme/static/scss/_sphinx_basic.scss

@@ -598,21 +598,14 @@ ol.upperroman {
 //     margin-bottom: 0px;
 // }
 
-ol.simple ol p,
-ol.simple ul p,
-ul.simple ol p,
-ul.simple ul p {
-    margin-top: 0;
-}
-
-ol.simple > li:not(:first-child) > p,
-ul.simple > li:not(:first-child) > p {
-    margin-top: 0;
-}
+.simple {
+    p {
+        margin-bottom: 0;
+    }
 
-ol.simple p,
-ul.simple p {
-    margin-bottom: 0;
+    li > & {
+        margin-bottom: 1em;
+    }
 }
 
 dl.footnote > dt,