Add DarkModePlugin toggle button to site

[markkerrigan]

I looked and I don't see the button to toggle it on and off. Maybe adding the following in MainMenu would be the most logical?

<<darkMode label:"☀️/🌘">>

[YakovL]

Hi Mark, I've thought about this a bit, and while I think it would be nice to have a switch, it's better to make it look nice first. I've already updated the plugin with a custom class for the button, so now it's possible to make it use just one icon (depending on the current mode: 🌘 in the light mode and ☀️ in the dark mode), the other thing I'd like to implement is to avoid it taking an extra line in a menu. I'm thinking about placing it in the same line as "options »", but it's stil a bit ugly when I put it "as is", both due to the distances and to the hover differences (ok, not very visible on screenshots, but my current capturing app got gif recording broken):

I'll think more about it, but if you have a suggestion about where/how to place the button, please let me know.

PS Yeah, in fact, the search UI also needs improvement (why 2 lines? why button before the input? paddings are not nice, ...)

Checking some references...

I think I'll work on it, too. I've added already a "label" param to the <<search>> macro for the next version (i.e. button label), can now use 🔎 for it, but there's much work left...