Respond to Google Drive removing web hosting

A twitter user observed that some of our examples on the StoryMap home page have broken.

My quick triage is that this is because they were created when StoryMap used Google Drive as its storage. To address this issue we should:

• test all Knight Lab StoryMap examples, linked from the home page and from possibly the gigapixel page
• Most of them should have been imported to the S3-hosted version of StoryMap. If so, we can just get a new "share" URL and update the examples links. I believe those are owned by the Knight Lab Google account.
• If they weren't imported, we may be able to reconstruct them. I can advise further.

Everyone doing tech support should get a basic understanding of what's going on here. I don't think we'll have a ton of questions, because anyone who has logged in to StoryMap since about 0421ce66b2fab7efe9bd0461ba2ff61b9209aab5 should have their work on S3. But we've been surprised before, there are still timelines out there using verite.co URLs

Start by testing every Knight Lab StoryMap example linked from the home page and possibly the gigapixel page. Check whether each example was imported to the S3-hosted version, then obtain replacement share URLs or identify examples needing reconstruction. Done means the listed examples work and their links no longer depend on removed Google Drive hosting.