Remove unused navigator component
Remove unused navigator component

"Module" contains no references within the codebase; uses Backbone
history for navigation (something Troposphere is not using).

When reviewing the files within `troposphere/static/js`, I noticed that
`navigator.js` was present and (yet) was not a file I had seen imported
during work on ES6 modules.

CCI-MOC/GUI-Frontend,CCI-MOC/GUI-Frontend,CCI-MOC/GUI-Frontend,CCI-MOC/GUI-Frontend,CCI-MOC/GUI-Frontend