Added image ignores, except for the default splash and icon images
Splash and Icon storage locations
Temporary html content for testing
Removed path module, and added image routes
Created route handlers to return images for a specific champion, given their id in the route
Added checks for champions that don't exist
Replaced default_splash and default_icon with default in /images
Created functions for duplicate callbacks and duplicate code in different route handlers
Replaced default_splash and default_icon with default in /images
Removed default_icon and default_splash
Replaced get404ImagePath function with pathTo404Image variable
Refactored image api to use one route instead of two that were almost identical
Rewrote validObjectId function since most route handlers will be using duplicate code