Add .md and .svelte as whitelist for text uploads

Fixes codesandbox#2222

Author: CompuIves

packages/app/src/app/overmind/namespaces/files/internalActions.ts

@@ -93,6 +93,8 @@ export const uploadFiles: AsyncAction<
             /\.haml$/.test(filePath) ||
             /\.pug$/.test(filePath) ||
             /\.svg$/.test(filePath) ||
+            /\.md$/.test(filePath) ||
+            /\.svelte$/.test(filePath) ||
             file.type.startsWith('text/') ||
             file.type === 'application/json') &&
           dataURI.length < MAX_FILE_SIZE

packages/app/src/app/store/modules/files/actions.js

@@ -139,6 +139,8 @@ export async function uploadFiles({ api, props, path }) {
               /\.haml$/.test(filePath) ||
               /\.pug$/.test(filePath) ||
               /\.svg$/.test(filePath) ||
+              /\.md$/.test(filePath) ||
+              /\.svelte$/.test(filePath) ||
               file.type.startsWith('text/') ||
               file.type === 'application/json') &&
             dataURI.length < MAX_FILE_SIZE