wezterm: Default to dark theme and general font

Generalized the font used from special ligaturized Iosevka to the
standard Iosevka installed in the bootstrap process.

Changed from a blindingly bright default color scheme to a nice dark one
(Nord).

wezterm/.config/wezterm/wezterm.lua

@@ -64,12 +64,12 @@ return {
     tab_bar_at_bottom = true,
     window_padding = { left = 0, right = 0, top = 0, bottom = 0 },
 
-    color_scheme = "Mexico Light (base16)",
+    color_scheme = "Nord (base16)",
 
     -- default_prog = {"nu"},
     scrollback_lines = 10000,
 
-    font = wezterm.font('Liga Iosevka'),
+    font = wezterm.font('Iosevka'),
     line_height = 1.0,
 
     leader = { key = 'a', mods = 'CTRL', timeout_milliseconds = 1500 },