Replace AWS Lambda adapter with custom function

netlify/functions/validate-pr/index.ts

@@ -1,14 +0,0 @@
-import {
-  createLambdaFunction,
-  createProbot
-} from '@probot/adapter-aws-lambda-serverless';
-
-import { appFn } from '../../../appFn';
-
-const privateKey = (process.env.PRIVATE_KEY as string).replace(/\\n/gm, '\n');
-
-const handler = createLambdaFunction(appFn, {
-  probot: createProbot({ overrides: { privateKey } })
-});
-
-export { handler };

netlify/functions/validate-pr/package.json

@@ -1,4 +0,0 @@
-{
-  "name": "dummy-package-json",
-  "version": "1.0.0"
-}