Option to disable color-changing

[1bcb]

Is your feature request related to a problem? Please describe.
Geopard's behavior of flashing a different color on each site is an accessibility barrier. While I have no doubt it looks good for some people, using it for a few minutes gives me a headache and eyestrain due to the color changes.

Describe the solution you'd like
I'd like an option to disable the color-changing and have a single solid dark background color for all gemini sites.

Describe alternatives you've considered
As mentioned above, I can't currently use Geopard at all without significant pain, so my only alternative is to use a different client.

However, I want to be able to use Geopard, because I do typically like libadwaita apps. Geopard can also scroll horizontally on very wide ASCII images, which Lagrange and many other clients can't do.

[tfuxu]

@1bcb You can disable unique website colors in configuration file. Refer to this part of README to find the file path, open config.toml and change colors preference value to false.

[1bcb]

Thank you!