chore: add prettier pre-commit hook

.pre-commit-config.yaml

@@ -45,3 +45,9 @@ repos:
     rev: 5.0.4
     hooks:
       - id: flake8
+
+  - repo: https://github.com/pre-commit/mirrors-prettier
+    rev: v2.7.1
+    hooks:
+      - id: prettier
+        files: \.(md|yml|yaml|json)$