Provide pre-commit checks to ensure everything is likely to work

We can provide a bunch of pre-commit checks to catch common errors and, in some cases, provide scripts to help.

- [x] Build a script to check the deploy, visualize, nested template and script URLs - reject commit if they don't match the git branch
- This also needs to be run on pre-merge via the web UI, otherwise we run the risk of master not having the correct values
- [ ] Build a script to automatically update the deploy, visualize, nested template and script URLs - reject commit if they don't match the git branch