Proposal: Hide sprint list and require a secret URL to access a sprint

[tobiasmcnulty]

For public use it might be nice to hide the public sprint list (so not just anyone can get into your sprint), and require a secret URL to join it (similar to https://www.shortreckonings.com/). We could:

• Move the "new sprint" form to the home page and remove the name validation.
• Assign both an ID and name to a sprint. The ID would appear in the URL, whereas the name would only be visible on the sprint detail page.
• Delete the sprint list from the home page.

It might be good to think about this around the same time as #23 (DB persistence).