[feature] Purely visual monitoring mode

[mariomadproductions]

Version and OS N/A

Is your feature request related to a problem? Please describe. Some/many websites change elements regularly, so watching specific elements is not reliable.

Describe the solution you'd like A mode that just compare the visual output (screenshot) of the website would be useful for this.

Describe the use-case and give concrete real-world examples See above

Additional context None