Remove duplicate routes declaration. Import common component.

[hasparus]

Example solution for #58. Makes code DRier :)

[piranna]

I have been working on a more in-depth solution, and for example templates/re-start/App.js is not used anymore, just only templates/re-start/src/index.js instead of Main. Could you be able to change the names according to this?

[piranna]

I have finished the pull-request for my refactor, if you want to take it a look.