Setup image import correctly

[mattam]

Because we need to import our static local files at build time, we need to use the switch/case statement to require() in the files.

To keep things clean, we should namespace our data/tours/tour_0/images files so that they are distinguishable from future tour_1 files.

so the files should be named:

tour_0_chez-maman.jpg
tour_0_location_0.png
tour_0_vive-la-tarte.jpg

Also clean the switch/case statement so that it uses the new path. (Eventually we'll have to setup a smarter function to take in the tour_num and the file_name and construct the correct path to return the image require() from.