some style adjustments for the sidebar

There is no need to differentiate between site tools and the navigation
anymore. Instead now it's differentiated between the navigation tools
and the displayed content.

css/area_main-sidebar-content.less

@@ -0,0 +1,14 @@
+/**
+ * This file provides the design styles the non-navigational elements in the sidebar
+ */
+#dokuwiki__aside {
+
+    // do not indent the first level of lists in the sidebar
+    ul, ol {
+        padding-left: 0;
+
+        ul, ol {
+            padding-left: 1.5em; // same padding as defined in base styles
+        }
+    }
+}