linter: 💅 add markdownlint

Author: maxbarsukov

.markdownlint.jsonc

@@ -0,0 +1,19 @@
+{
+  // Style of unordered lists..
+  "MD007": {
+    "indent": 2,
+    "start_indented": true
+  },
+
+  // no-trailing-spaces: true
+  "MD009": false,
+
+  // Line length. Who cares.
+  "MD013": false,
+
+  // Multiple headings with the same content. That's fine.
+  "MD024": false,
+
+  // Cause I love inlining a little HTML in my markdown.
+  "MD033": false
+}