Update app.js

[jason-fox]

Proposed changes

Disable CSP if running an insecure HTTP instance.Setting a proper Content Security Policy (CSP) makes no sense if just running a simple test environment over HTTP. Only if HTTPS is enabled should the default policy be restricted. Note that the OAuth2 authorisation code flow will not work without liberalising the IDM_CSP_FORM_ACTION to relevant callback sites e.g.: IDM_CSP_FORM_ACTION=example.com, test.com

Types of changes

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• [ ] Bugfix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

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• [x] I have read the CONTRIBUTING doc
• [x] I have signed the CLA
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x ] I have added necessary documentation (if appropriate)
• [ ] Any dependent changes have been merged and published in downstream modules

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