Should be bumped to the latest version of next

[wbunting]

Remove the unstable methods + add preview mode.

@ijjk I took a stab at this on a fork:
https://github.com/wbunting/notion-blog

Adds some api routes to enable / disable preview mode as well as adds a banner to show the user that they are in preview and which posts are drafts.

If the changes look good to you I can PR on this repo with the patch.

[wbunting]

It would also be pretty sick to get this set up with Deploy Hooks. That way if your preview looks good you can click "rebuild SSG" or something to sync up to production

[ijjk]

Hi, the changes on your fork look awesome, I would definitely appreciate a PR with those changes!

A few things I noticed that can be updated:

• combine api/clear-preview and api/clear-preview-post into a single endpoint and redirect to /blog if no slug query value
• the exit preview mode button looks like it could use flex-direction: column to make sure the text is centered vertically
• the fallback state for lazy blog posts isn't currently handled, we'll want to show a loading state when useRouter().isFallback is true

Feel free to open the PR and I can help tweak these things if you'd like, thanks for looking into this!