itkwasm-elastix Site Feedback

[tbirdso]

A couple of feedback notes and thoughts on the new itkwasm-elastix site (https://itk-wasm-elastix-app-js.on.fleek.co/?functionName=elastix) as of 2023-10-02:

• Elements from the itkwidgets view appear on top of the image download "format" combobox when expanded. Would expect the itkwidgets view to appear fully behind the combobox. May be an itkwidgets issue rather than an itkelastix site issue.
  

• The automatic cyan-to-magenta image mix is a bit overwhelming, and I'm unclear on what it adds to the image visual since voxel region comparison is already addressed with checkerboarding. Consider disabling by default and/or adding a warning about flashing colors.
  

cc @thewtex @PaulHax