Updated dependencies + CSP middleware configuration

[quietbits]

• Added Content Security Policy (CSP) middleware configuration
  • Scripts still have some issues, but it's better than it was before
• Updated dependencies
• Small linting fixes

[stellar-jenkins]

Preview is available here:
http://laboratory-pr884.previews.kube001.services.stellar-ops.com/

[stellar-jenkins]

Preview is available here:
http://laboratory-pr884.previews.kube001.services.stellar-ops.com/

[stellar-jenkins]

Preview is available here:
http://laboratory-pr884.previews.kube001.services.stellar-ops.com/

[stellar-jenkins]

Preview is available here:
http://laboratory-pr884.previews.kube001.services.stellar-ops.com/