feat: add iTerm theme

[jose-elias-alvarez]

Thanks for the great theme! It's been a while since I found something so pleasant and usable.

This PR adds a simple port of the Alacritty theme to iTerm.

[rmehri01]

Hey there, thanks for the pr and the kind words!

I think Alacritty is a bit of a special case since it seems to be a bit brighter than Kitty for example but let me know if it's different for you. I made the Kitty colors a bit brighter because of this so I would recommend following those.

One more thing is that I think the normal Nord theme for iTerm has some pretty nice defaults, so I would build off starting from that for some of the options like cursor guide and you can do so too if you'd like or I could give it a try!

[rmehri01]

I'll also tag @shMorganson since they seemed to have an iTerm theme too and might have some suggestions!

[jose-elias-alvarez]

Got it. I tweaked it to use the original Nord theme as a base and the colors from the Kitty theme instead. On my screen, Kitty and iTerm now look identical in terms of colors (there's some minor rendering differences).

I don't really use the cursor guide, so I'm not sure what it's supposed to look like, but I left it alone for now.

Edit: The color used for selection_background in Kitty seemed like a good option for the cursor guide. Let me know how it looks!

[rmehri01]

This looks great, thanks again!