Automatic contrast color picking (fixes #43)

config.toml

@@ -99,13 +99,6 @@ accent_color = "#ff7800"
 # Ditto but for the dark theme.
 # If not set regular variant will be used.
 accent_color_dark = "#ffa348"
-# Whether to fix low contrast in text selection, checkboxes, etc.
-# Use only if the default doesn't provide enough contrast, e.g. the accent color is set to yellow.
-#
-# fix_contrast = true
-#
-# Ditto but for the dark theme.
-fix_contrast_dark = true
 # Whether to use fonts bundled with Duckquill instead of system ones.
 # Keep in mind that it also changes the style of headings.
 #