feat: add support for editing pages in Netlify CMS

Adds support for writing blog posts and editing privacy policy and terms pages.

To use,
- You must already be using Netlify to deploy your site
- Login to Netlify and setup your editors under the Identity section
- Head over to YOUR_URL/admin/

See https://github.com/gcushen/hugo-academic/issues/1191

netlify.toml

@@ -3,7 +3,7 @@
   publish = "public"
 
 [build.environment]
-  HUGO_VERSION = "0.63.1"
+  HUGO_VERSION = "0.64.0"
   HUGO_ENABLEGITINFO = "true"
 
 [context.production.environment]