fix: sections scroll issue

Fixes #28

Signed-off-by: Sekwah <[email protected]>

Author: sekwah41

theme/_sass/components/_sections-list.scss

@@ -17,6 +17,8 @@
 .sections-list.affix {
 	position: fixed;
 	top: 90px;
+	bottom: 20px;
+	overflow: scroll;
 }
 
 .sections-list.affix-bottom {