chore(linter): add remark to lint markdown files

Author: Calvin-LL

.remarkrc

@@ -0,0 +1,10 @@
+{
+  "plugins": [
+    "remark-preset-lint-recommended",
+    "remark-lint-no-dead-urls",
+    [
+      "remark-lint-list-item-indent",
+      false
+    ]
+  ]
+}

lint-staged.config.js

@@ -1,4 +1,5 @@
 module.exports = {
   "*.{js,jsx,ts,tsx}": "eslint --fix",
   "*.{js,jsx,ts,tsx,css,less,scss,vue,json,gql,md}": "prettier --write",
+  "*.{md}": "remark",
 };