Mangerie Online: quickfix & mobile support

First (very small) update to Mangerie Online:

• Patched a bug where the game got stuck if you moved the mirror angler 1 position to the left and then switched images. If you spot any more bugs (or have general suggestions for content you'd like to see), feel free!
• Added a version of Mangerie Online that supports portrait orientation to my own site (https://www.planetegem.be/eb/mangerie_online). Playing on a device in landscape orientation (read: a desktop) is still my preference, but this way you can have a look on mobile as well.