feat: grub config & instructions (based on catppuccin)

grub/grub

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+GRUB_TIMEOUT=3
+GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)"
+GRUB_DEFAULT=saved
+GRUB_DISABLE_SUBMENU=true
+# GRUB_TERMINAL_OUTPUT="console"
+GRUB_CMDLINE_LINUX="rd.luks.uuid=luks-5e345064-0ca5-4162-a7ef-624907ae9adf rhgb quiet"
+GRUB_DISABLE_RECOVERY="true"
+GRUB_ENABLE_BLSCFG=true
+GRUB_THEME="/boot/themes/catppuccin-macchiato-grub-theme/theme.txt"

grub/themes/catppuccin-macchiato-grub-theme/theme.txt

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+# GRUB2 gfxmenu pop theme, based and inspired by Vimix and Dracula grub themes
+# Designed for any resolution
+
+# Global Property
+title-text: ""
+desktop-image: "background.png"
+desktop-image-scale-method: "stretch"
+desktop-color: "#24273A"
+terminal-font: "Unifont Regular 16"
+terminal-left: "0"
+terminal-top: "0"
+terminal-width: "100%"
+terminal-height: "100%"
+terminal-border: "0"
+
+# Logo image
++ image {
+	left = 50%-50
+	top = 50%-50
+    file = "logo.png"
+}
+
+# Show the boot menu
++ boot_menu {
+  left = 50%-240
+  top = 60%
+  width = 480
+  height = 30%
+  item_font = "Unifont Regular 16"
+  item_color = "#CAD3F5"
+  selected_item_color = "#CAD3F5"
+  icon_width = 32
+  icon_height = 32
+  item_icon_space = 20
+  item_height = 36
+  item_padding = 5
+  item_spacing = 10
+  selected_item_pixmap_style = "select_*.png"
+}
+
+# Show a countdown message using the label component
++ label {
+  top = 82%
+  left = 35%
+  width = 30%
+  align = "center"
+  id = "__timeout__"
+  text = "Booting in %d seconds"
+  color = "#CAD3F5"
+}