Make the code easier to generalize for other tram systems.

[simonprickett]

Make the code easier to generalize for other tram systems...

• Split out the station information that's in the front end into a JSON file or JS file that can be included.
• Split out the station information that's in the back end into a JSON file or JS fiole that can be included.
• Look at putting the original centre point of the map into some sort of configuration file that can be included.

There may also be other things that would require a build system e.g.

• Text in the static HTML file.