site: support new folder structure in REPL (#2945)

* site: support files in directories in /repl/local/

* site: bump @sveltejs/svelte-repl

Author: Conduitry

site/package-lock.json

@@ -39,7 +39,7 @@
     "@babel/runtime": "^7.4.4",
     "@sindresorhus/slugify": "^0.9.1",
     "@sveltejs/site-kit": "^1.0.4",
-    "@sveltejs/svelte-repl": "^0.1.2",
+    "@sveltejs/svelte-repl": "^0.1.5",
     "degit": "^2.1.3",
     "dotenv": "^8.0.0",
     "eslint-plugin-svelte3": "^1.0.0",

site/package.json

@@ -1,12 +1,13 @@
 import { createReadStream } from 'fs';
 
 export function get(req, res) {
-	if (process.env.NODE_ENV !== 'development' || !/^[a-z.]+$/.test(req.params.file)) {
+	const path = req.params.file.join('/');
+	if (process.env.NODE_ENV !== 'development' || ('/' + path).includes('/.')) {
 		res.writeHead(403);
 		res.end();
 		return;
 	}
-	createReadStream('../' + req.params.file)
+	createReadStream('../' + path)
 		.on('error', () => {
 			res.writeHead(403);
 			res.end();