Switch to CJS for markdownlint config (#3115)

More consistent with other existing config files.

.markdownlint-cli2.cjs

@@ -0,0 +1,12 @@
+module.exports = {
+	config: {
+		// MD010/no-hard-tabs
+		MD010: false,
+		// MD013/line-length
+		MD013: false,
+		// MD024/no-duplicate-heading/no-duplicate-header
+		MD024: false,
+		// MD033/no-inline-html
+		MD033: false,
+	},
+};

.markdownlint.yml

@@ -1,11 +0,0 @@
-# MD010/no-hard-tabs - Hard tabs
-MD010: false
-
-# MD013/line-length - Line length
-MD013: false
-
-# MD024/no-duplicate-heading/no-duplicate-header - Multiple headings with the same content
-MD024: false
-
-# MD033/no-inline-html - Inline HTML
-MD033: false