Remove crystal-grub theme due to it being missing from the repos, resolves #15

src/functions/base.rs

@@ -58,7 +58,6 @@ pub fn install_bootloader_efi(efidir: PathBuf) {
         "grub",
         "efibootmgr",
         "grub-btrfs",
-        "crystal-grub-theme",
         "os-prober",
     ]);
     let efidir = std::path::Path::new("/mnt").join(efidir);
@@ -89,13 +88,6 @@ pub fn install_bootloader_efi(efidir: PathBuf) {
         ),
         "install grub as efi without --removable",
     );
-    files_eval(
-        append_file(
-            "/mnt/etc/default/grub",
-            "GRUB_THEME=\"/usr/share/grub/themes/crystal/theme.txt\"",
-        ),
-        "enable crystal grub theme",
-    );
     exec_eval(
         exec_chroot(
             "grub-mkconfig",