update .markdownlint.json

Author: tekezo

.markdownlint.json

@@ -1,11 +1,16 @@
 {
+  "MD007": {
+    "indent": 4
+  },
   "MD013": false,
   "MD030": {
+    "ul_single": 3,
+    "ul_multi": 3,
     "ol_single": 2,
     "ol_multi": 2
   },
   "MD033": {
-    "allowed_elements": ["br"]
+    "allowed_elements": ["br", "img"]
   },
   "MD041": false
 }