Improve precommit (#14)

Switched from husky to simple-git-hooks which does not require separate
.husky folder

Switched from huge lint-staged to very small nano-staged.

https://packagephobia.com/result?p=lint-staged
https://packagephobia.com/result?p=nano-staged

```diff
du -ckd1 node_modules
- 292316
+ 273964
```

package.json

@@ -8,7 +8,6 @@
   "author": "Renato Ribeiro <hi@rena.to>",
   "license": "MIT",
   "scripts": {
-    "prepare": "husky install",
     "clean": "rm -rf ./dist",
     "codegen": "graphql-codegen -r dotenv-flow/config",
     "type-check": "tsc --noEmit",
@@ -17,9 +16,13 @@
     "e2e": "yarn build && yarn jest --testPathPattern=e2e",
     "prepublishOnly": "yarn e2e",
     "debug": "node -r dotenv-flow/config src/tmp/debug.js",
-    "docs": "typedoc src --readme none --githubPages false"
+    "docs": "typedoc src --readme none --githubPages false",
+    "prepare": "simple-git-hooks"
   },
-  "lint-staged": {
+  "simple-git-hooks": {
+    "pre-commit": "./node_modules/.bin/nano-staged"
+  },
+  "nano-staged": {
     "*.{ts,css,md}": "prettier --write"
   },
   "files": [
@@ -42,10 +45,10 @@
     "@types/jest": "^29.5.2",
     "dotenv-flow": "^3.2.0",
     "eslint": "^7.23.0",
-    "husky": "^6.0.0",
     "jest": "^29.5.0",
-    "lint-staged": "^10.5.4",
+    "nano-staged": "^0.8.0",
     "prettier": "^2.2.1",
+    "simple-git-hooks": "^2.8.1",
     "ts-jest": "^29.1.0",
     "typedoc": "^0.22.4",
     "typedoc-plugin-markdown": "^3.11.2",