Update sharp, remove deprecated max fn call, retrieve image urls and …

[alxvallejo]

…save to firebase rtdb.

Updating the example here on how to better use the sharp node lib to parse and save to the firebase db.

Sorry for the formatting - i'm actually have some minor issue with VSCode on that. If anyone can assist there that'd be great.

[NickFoden]

Hi @alxvallejo in vscode, you can "Command + Shift + P" to select a save without formatting, this might help you reduce the amount of whitespace, etc changes?