Add options to configure Night Mode CSS overrides
Issue: Images do not always display properly when using Night Mode. They do display when Night Mode is turned off.
To reproduce the issue, do one of the following:
1. Go to instagram.com/ashies_axies with night mode enabled
2. Perform a Google search for "axolotl" and click on the Images tab with night mode enabled
In both cases, you can long-press where the image should be and you can see that it's there but not properly rendered. Disable night mode to make the images appear. Note that this does NOT happen when looking at the image results of a searx.me search. Those render as expected, and I haven't tried other search engines yet.