Due to causing content images to be rendered in unexpected ways.
- Also removed CSS filters from other image usage.
- Tweaked header CSS filtering to not be so aggressive.
- Forced WYSIWYG editor to be on its own layer since that would allow
massive larger performance increases in Safari, especially when using
dark mode.
Closes#2045.
Closes#2154.
Generally seems to cause issues when secure images are in use.
Was added during laravel upgrade but laravel does not use this directly
for its web middleware anyway.
- Most elements done, but still need to do editors, tables and final
pass.
- Toggled only by quick js check at the moment, checking via css media
query. Need to make into user-preference toggle.
For #1234
