Allow adding images to storage

[amaclean2]

Steps

• [x] Create a space for file storage
• [x] Set up docker volumes to make that space reliable
• [x] Use multer to add and remove files from the storage
• [x] Create a thumbnail of the image to save alongside the image
• [x] Receive the userId or adventureId from the webapp and save the url to the right user/adventure
• [x] Read those files through the SundayPeak url
• [x] Handle all three cases for saving an image
• [x] Deploy