feat: added the IMAGE_BASE_URL key to the sample.env file (#15970)
feat: added the IMAGE_BASE_URL key to the sample.env file (#15970)

* feat: added the IMAGE_BASE_URL key to the sample.env file.

* Add subfolder per tchaffee's suggestion

raisedadead/FreeCodeCamp,MiloATH/FreeCodeCamp,otavioarc/freeCodeCamp,matthew-t-smith/freeCodeCamp,pahosler/freecodecamp,no-stack-dub-sack/freeCodeCamp,FreeCodeCamp/FreeCodeCamp,BerkeleyTrue/FreeCodeCamp,MiloATH/FreeCodeCamp,BhaveshSGupta/FreeCodeCamp,BhaveshSGupta/FreeCodeCamp,systimotic/FreeCodeCamp,HKuz/FreeCodeCamp,FreeCodeCamp/FreeCodeCamp,matthew-t-smith/freeCodeCamp,FreeCodeCampQuito/FreeCodeCamp,otavioarc/freeCodeCamp,systimotic/FreeCodeCamp,Munsterberg/freecodecamp,no-stack-dub-sack/freeCodeCamp,FreeCodeCampQuito/FreeCodeCamp,Munsterberg/freecodecamp,HKuz/FreeCodeCamp,BerkeleyTrue/FreeCodeCamp,jonathanihm/freeCodeCamp,pahosler/freecodecamp,jonathanihm/freeCodeCamp,BhaveshSGupta/FreeCodeCamp,raisedadead/FreeCodeCamp