improve prettier support, add pre-commmit hook

.husky/pre-commit

@@ -0,0 +1 @@
+npx lint-staged

.prettierignore

@@ -0,0 +1,4 @@
+node_modules
+example/encrypted
+package-lock.json
+index.html

package.json

@@ -28,7 +28,14 @@
     ],
     "license": "MIT",
     "scripts": {
-    "build": "bash ./scripts/build.sh"
+        "build": "bash ./scripts/build.sh",
+        "format": "prettier --write \"**/*.{js,json,html}\"",
+        "prepare": "husky"
+    },
+    "lint-staged": {
+        "**/*.{js,json,html}": [
+            "prettier --write"
+        ]
     },
     "repository": {
         "type": "git",
@@ -49,6 +56,8 @@
     },
     "homepage": "https://github.com/robinmoisson/staticrypt",
     "devDependencies": {
-    "prettier": "^2.8.7"
+        "husky": "^9.1.6",
+        "lint-staged": "^15.2.10",
+        "prettier": "^2.8.8"
     }
 }