Add photos for "The Joker"

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Thank you for contributing to A Field Guide to Elephpants. To speed up approval of your contribution, please review the following checklist:

• [x] I have read the CONTRIBUTING guide
• [x] All text and photographs included are licensed under CC:BY-NC-SA or a compatible license.
• [x] (If Needed) New subspecies have been added to sculpin_site.yml following the naming convention.