chore: merge two branches with 'octopus' strategy

Merge branches 'feat-setup-improve-color-contrast' and
'feat-setup-improve-private-statusbar' into 'dev'.

Addresses:

- catppuccin#3
- catppuccin#4

Author: trueNAHO

setup.py

@@ -290,11 +290,11 @@ def setup(c, flavour, samecolorrows = False):
 
     ## PRIVATE MODE COLORS
     ## Background color of the statusbar in private browsing mode.
-    c.colors.statusbar.private.bg = palette["mantle"]
+    c.colors.statusbar.private.bg = palette["crust"]
     ## Foreground color of the statusbar in private browsing mode.
     c.colors.statusbar.private.fg = palette["subtext1"]
     ## Background color of the statusbar in private browsing + command mode.
-    c.colors.statusbar.command.private.bg = palette["base"]
+    c.colors.statusbar.command.private.bg = palette["crust"]
     ## Foreground color of the statusbar in private browsing + command mode.
     c.colors.statusbar.command.private.fg = palette["subtext1"]