chore: move files under "files" field in tsconfig.json

tsconfig.json

@@ -13,6 +13,7 @@
     "target": "es5"
   },
   "exclude": ["node_modules"],
+  "files": ["./hardhat.config.ts"],
   "include": [
     "artifacts/**/*",
     "artifacts/**/*.json",
@@ -20,7 +21,6 @@
     "tasks/**/*",
     "test/**/*",
     "typechain/**/*",
-    "types/**/*",
-    "hardhat.config.ts"
+    "types/**/*"
   ]
 }