feat(husky): Add post-merge hook and prepare script

.husky/post-merge

@@ -0,0 +1,2 @@
+npm install --no-audit --no-fund
+npm run build

package.json

@@ -20,7 +20,8 @@
     "cli:dev": "tsc -p tsconfig.cli.json --watch",
     "cli:build": "tsc -p tsconfig.cli.json",
     "ttrpg": "node --loader ts-node/esm ./src/cli/index.ts",
-    "test": "jest"
+    "test": "jest",
+    "prepare": "husky"
   },
   "keywords": [
     "ttrpg",