Update vercel build config (#1276)

Author: gksander

website/docusaurus-vercel.config.js

@@ -11,7 +11,8 @@ async function createConfig() {
     tagline:
       'A React.js based library for creating sleek presentations using JSX syntax that gives you the ability to live demo your code.',
     url: 'https://formidable.com',
-    baseUrl: '/open-source/spectacle',
+    baseUrl:
+      process.env.VERCEL_ENV === 'preview' ? '/' : '/open-source/spectacle',
     onBrokenLinks: 'throw',
     onBrokenMarkdownLinks: 'warn',
     favicon: 'img/favicon.ico',

website/docusaurus.config.js

@@ -34,7 +34,7 @@
     "docusaurus": "docusaurus",
     "start": "docusaurus start",
     "build": "docusaurus build --out-dir build/open-source/spectacle",
-    "build:vercel": "docusaurus build --out-dir build/open-source/spectacle --config docusaurus-vercel.config.js",
+    "build:vercel": "docusaurus build",
     "clear": "docusaurus clear",
     "serve": "formideploy serve",
     "deploy:stage": "formideploy deploy --staging",
@@ -124,4 +124,4 @@
       "last 1 safari version"
     ]
   }
-}
+}