Layers selection area pushes other UI elements offscreen

[dundir]

I recently tried this application out with a docker image containing 32 layers.

The Image and Layer Details portion of the screen ends up being cut off at the bottom of the screen making the details unreadable.

[summea]

I think this type of situation happens for me as well for a Docker image that has many layers (e.g., more than 40). Was trying to see the details about wasted space for my case. Ended up using the CI=true dive <your-image> approach from the instructions for now.

[wagoodman]

Implemented in #399