Revert "[#30] Remove unnecessary files from dist folder"

This reverts commit 9a3e39fa472abb279c219dc5c5a96d455a19d852.
Revert "[#30] Remove now-unnecessary images"

This reverts commit 32c0911bb4f12e4206d376e4f55e9f92514a90b8.
Revert "[#30] Improvements to the size of the box-shadow for high-res/zoomed-out devices"

This reverts commit cd190a0807265561c6b188b2869ba45065d08fc0.
Revert "Fixes #30 by using box-shadow instead of images and simplifying buildWalkthrough in the process"

This reverts commit ce2dade3fba2c8b59eccd73f4bb61ecb0ad1a79b.