Add autumn theme

[getreu]

Screenshot:

And discussion here: #727 (comment)

Feedback is welcome.

[the-mikedavis]

There are some other scopes you'll want to theme as well:

• ui.virtual.whitespace: visible whitespace characters (:set whitespace.render all if running on latest changes)
• ui.virtual.ruler: the rulers (:set rulers [80], also merged after 22.03)

For both you'll probably want a color close to what gets used for comments but maybe dimmer/darker. For whitespace you'll probably want that configured as "ui.virtual.whitespace" = { fg = "that_color" } and for the ruler: "ui.virtual.ruler" = { bg = "that_color" }

[getreu]

@the-mikedavis I added a ruler colour a just a little lighter than the background, so that you can see it without effort, without becoming dominant. I chose the whithespace colour a little lighter than comments. Otherwise one would not see the little dot in the middle comfortably.

[the-mikedavis]

Looks great, thanks!

I love a warm color palette 🎨

[the-mikedavis]

Could you please add a screenshot to the themes wiki https://github.com/helix-editor/helix/wiki/Themes?

[getreu]

Could you please add a screenshot to the themes wiki https://github.com/helix-editor/helix/wiki/Themes?

Done. See Theme: Autumn · helix-editor/helix Wiki