feat: generate Alacritty files in toml instead of yaml (#158)

Newer versions of Alacritty use the toml format instead of yaml.

extras/alacritty/zenburned.toml

@@ -0,0 +1,25 @@
+# This file is auto-generated by shipwright.nvim
+[colors.bright]
+black = "#625A5B"
+red = "#EC8685"
+green = "#8BAE68"
+yellow = "#D68C67"
+blue = "#61ABDA"
+magenta = "#CF86C1"
+cyan = "#65B8C1"
+white = "#C0AB86"
+[colors.cursor]
+cursor = "#F3EADB"
+text = "#404040"
+[colors.normal]
+black = "#404040"
+blue = "#6099C0"
+cyan = "#66A5AD"
+green = "#819B69"
+magenta = "#B279A7"
+red = "#E3716E"
+white = "#F0E4CF"
+yellow = "#B77E64"
+[colors.primary]
+background = "#404040"
+foreground = "#F0E4CF"