The user can now compare the stats of multiple characters with two
graph (column graph and polar spider).
Small refactor of the displayPolarSpider function to work in all pages.
A net::ERR_CLEARTEXT_NOT_PERMITTED occured when using the app on android
phone, we have to force the android to allow the communication to fix
the problem.
More info : https://stackoverflow.com/a/54752717/10736081
Also fixed a problem with the images path when running the app on
mobile.