Add peekViewEditor colors for dark theme

[this-fifo]

Fix #38

[this-fifo]

hi @simurai , while the default colors seem to work well for the light theme they are a bit off for the dark theme as @orsenkucher pointed out

I tried using the same orange as the title for the borders but I thought the default blue looked better instead so I left that one as is

[orsenkucher]

@this-fifo now it looks a lot better bro!
Though I think we can make background a bit more bluish or distinct again.
And also add "peekViewResult.matchHighlightBackground": "#ffd33d44",
and maybe decrease intensiveness from #ffd33d44 to #ffd33d33 for peekViewEditor

[orsenkucher]

@this-fifo @simurai, I know it can get messed up rly quickly, but we can try to approach highlights like Pop N' Lock did

Basically give to it some borders and matching fill color. And maybe switch from orange to bluish green color

What do you think?

[this-fifo]

I added the peekViewResult.matchHighlightBackground and decreased the peekViewEditor as you suggested, it does feel nicer! Thanks @orsenkucher 🙏

As for the blueish/distinct background, I opted for something more along the lines of other popular dark themes that rely on the borders to create visual context, here's an example of how it looks like for

Dracula

And for Atom One Dark

And now github-vscode-theme

[orsenkucher]

Okey, sounds reasonable) I think this issue received great treatment and is basically ready to merge👍👍 @this-fifo

[simurai]

Didn't even know about this. 😅 Another option would be to "raise" the peekViewEditor, but we can consider another time.

Let's get this 🚢 ed. 👍