Handle imgur posts that are not direct links

[TimJentzsch]

Relevant issue: Closes #246

Description:

This handles Imgur links like https://imgur.com/OhUY1rS which don't link to the image directly. The bot will try to slap .jpg at the end to properly render the image.

This does not fix the display of the images in the transcription choice page. Those are more annoying to handle.

Checklist:

• [x] Code Quality
• [x] Pep-8
• [ ] Tests (if applicable)
• [x] Success Criteria Met
• [x] Inline Documentation
• [ ] Wiki Documentation (if applicable)