Configure helix and ruff

- Make helix use ruff-lsp and pyright
- Configure ruff to my specifications
- Tweak a helix theme color or two

.config/helix/themes/base16_qvp.toml

@@ -18,7 +18,7 @@
 "ui.text" = "base05"
 "operator" = "base05"
 "ui.text.focus" = "base05"
-"variable" = "base08"
+"variable" = "base09"
 "constant.numeric" = "base09"
 "constant" = "base09"
 "attribute" = "base09"
@@ -26,12 +26,12 @@
 "ui.cursor.match" = { fg = "base0A", modifiers = ["underlined"] }
 "string"  = "base0B"
 "variable.other.member" = "base08"
-"constant.character.escape" = "base0C"
+"constant.character.escape" = "base08"
 "function" = "base0D"
 "constructor" = "base0D"
 "special" = "base0D"
 "keyword" = "base0E"
-"label" = "base0E"
+"label" = "base0A"
 "namespace" = "base0E"
 "ui.help" = { fg = "base06", bg = "base01" }