Fix edge cases with deleting last org/project

[matt-aitken]

There were a few bugs with project/org deleting

• The code that selects the best project to show if there's no cookie and the user lands on the root of the site wasn't factoring in deleted projects
• If you delete your last project (across all orgs) an error was happening
• If an org had any deleted projects (ever) it couldn't be deleted

You could create multiple orgs and projects with the same name by hitting entering twice on the new org page

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[matt-aitken]

If you delete the last project in an org and then navigate somehow to a different org you end up with an org you can't get to in the nav. This allows you to create a project for that org.