Provide the ability to set dark mode and change settings without Javascript

Description of the issue: I don’t like having the autocomplete in Brave Search, so I turn Javascript off. However, I have to turn it on briefly to select dark mode, then turn it off again, and my preference will then be saved for several hours, but I’ll have to do it again shortly. Additionally, it would be nice to be able to change settings without Javascript.

I actually don’t like autocomplete on anything, so I always turn it off if possible. It’s quite distracting.

However, it is nice that the search engine is very seamless without Javascript.