Initial setup fixes

[chrisdevereux]

Resolves a few incorrect settings on initial run:

• jest.jestCommandLine was not configured, causing an error to be displayed on first launch
• For some reason, the landing page was passing the map constructor to extra_context. This is removed.
• Fixes a syntax error in the dockerfile that was causing deploys to fail
• Ensures that the code is all formatter with prettier so that dependabot PRs don't all fail
• Updates dependencies
• Marks all dependencies in pyproject.toml with "*" range (relying on the lockfile to pin versions) so that dependabot opens PRs for major version changes.
• Removed wagtail from the default project – it isn't otherwise set up and we won't always want it in projects.
• Remove deprecated configuration
• Adds a default testcase so that django tests pass by default
• Don't fail ci when there aren't any frontend tests
• Removes safety from our CI flow (it was causing PRs containing security updates to fail if there are multiple outstanding security issues)