add random placeholder image from unsplash for TIL which doesn't have any. #necmttnio

make Unsplash API query search based on if a city has a unique name or not, if not unique just search for photos with “city”, if not unique search for “city, state, country” (e.g. George Town, Cayman Islands; George Town, Penang; George Town, India; George Town, Tasmania; George Town, Bahamas; etc) #nomads