Improve theme usage + add default ones

[kunalmohan]

• We no longer use gray color in the plugins and is no longer required in the theme.

Samples-

Solarized Dark

One Half Dark

Molokai Dark

Gruvbox Light

Gruvbox Dark

Dracula

[imsnif]

This is fantastic! One minor issue: this changed the default colors for me.

Before:

After:

Was this intentional?

[kunalmohan]

Was this intentional?

Yeah I switched the background color of the status bar from gray to black (since gray is removed no longer specified in the theme). Maybe we can set a lighter shade of black in the default_palette, if that's better?

[imsnif]

Hum - would that affect other stuff? Do we use this black color somewhere else in our UI?

[kunalmohan]

Ah..right. Black is used for text on the status bar. Using a lighter color may reduce the visibility of the text as well. But we can still change it to 236, it is lighter and still properly visible.

[imsnif]

Hmm... still not great. I just feel it would be a pity if we have to change our UI because we changed our API. Do you feel there's no other way?

[kunalmohan]

I don't think there's a way to maintain our current default UI other than by "hacking" the plugin specifically for when the default color palette is used. This may also confuse the user since the background and text color would be different when using the default theme and would be the same when using a user-defined theme. Users would expect the same behaviour when using themes.
Maybe we should consider keeping gray in the user-defined theme? The reason I removed it is because it may not be specified in many default themes available online and it will save the user the effort to find the right shade between white and black defined in the theme.
IMO the new UI, with black=236, looks good too. I think it's just a matter of being used to the current UI that makes the change look not so good initially.

[imsnif]

Okay, that's fair. I understand the tradeoffs now and when you put it this way, I totally agree. Let's go with 236. Otherwise this LGTM. Great work on this! Merge whenever you're ready :)

[bluss]

Thanks for adding themes. My Zellij usage can now start - with a theme that works for a light terminal. 🙂