Token chapter: add more images

[melodyserra]

[mikemaccana]

This is for the token chapter right? We're getting people to check explorer more frequently, so adding images of what this should look like. It will be pretty easy.

[mikemaccana]

Thanks for filing this @melodyserra ! This content was moved to https://solana.com/developers/courses/tokens-and-nfts/token-program and the single, giant script reduced to smaller, more digestable steps. The current content now shows the expected output of each step too (as text, but we refer text for script output!).