Add a scrool bar to NFT display to reduce image sizes.#55

A simple slider bar to reduce the image size of NFTs being displayed in wallet and while browsing (maybe at a certain point would switch the CSS to a list based display) so thatbusers can decide how many NFTs are displayed on page at any one point.

Slider’s a nice alternative to a simple toggle of preset scaling, will see what’s doable in terms of the way the card layouts are set up rn.