update(theme): adjust base16_transparent and dark_high_contrast

[GreasySlug]

• Use underline instead of modifier = ["underlined"]
• Add base theme author sign
• Adjust some colors

[the-mikedavis]

I think the documentation is currently incorrect about this underline style, it should be dotted:

helix/helix-view/src/graphics.rs

Line 323 in f323ffa

"dotted" => Ok(Self::Dotted),

[pascalkuthe]

Yeah I think I mixed that up 😅 I think the documentation was what I originally planning. We use curl and line so using the passive dotted and dashed seemed inconsistent. Perhaps this should be changed to dashes and dots in both documentation and implementation?

[the-mikedavis]

I think they're ok as passive - it makes sense to me as "dotted line" or "dashed line". When in doubt I would say we should follow whatever kitty says they are but it looks like then we would need to change to "curly" too for consistency: https://sw.kovidgoyal.net/kitty/underlines/

I think that just updating the documentation to say "dotted" would be the best choice to minimize breaking changes

[GreasySlug]

Also added dark_high_contrast