(sort of) finish image uploads for guides

# What's New?

 * Added image preview to guide form
 * Added image upload to guide form
 * Added [real] images to guide pages
 * Minor touchups in the mutations

# What's Next?

 * Holding off merge until Simon can review this. Please note, I broke some CSS and did not have time to fix. I am uploading this now as is for you to review. I will merge once the CSS issues are fixed.