Add pre-commit with prettier

.pre-commit-config.yaml

@@ -0,0 +1,19 @@
+# See https://pre-commit.com for more information
+# See https://pre-commit.com/hooks.html for more hooks
+repos:
+-   repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v3.2.0
+    hooks:
+    -   id: trailing-whitespace
+    -   id: end-of-file-fixer
+    -   id: check-yaml
+        exclude: "(^mkdocs\\.yml$)"
+    -   id: check-added-large-files
+-   repo: https://github.com/pre-commit/mirrors-prettier
+    rev: 'v3.0.3'
+    hooks:
+    -   id: prettier
+        types_or:
+          - javascript
+          - markdown
+          - jsx