Update documentation graphics

[cadic]

Is your enhancement related to a problem? Please describe.

• We now have "Type of show" dropdown, need to be updated on screenshot-3.png
• We have the "Classic" edit post screen on the screenshot-1.png. Need to add Block Editor screenshot as well (and update classic screenshot to the latest default theme colour palette). Or replace the classic screenshot with the block.

Designs

No response

Describe alternatives you've considered

No response

Code of Conduct

• I agree to follow this project's Code of Conduct