chore: reorganize all files into board/shredos

It is more convenient to not have to search for configuration files in different directories, and also helpful to see the standard configuration files, so move all ShredOS configurations into board/shredos.

Signed-off-by: desertwitch <24509509+desertwitch@users.noreply.github.com>

fs/iso9660/README

@@ -0,0 +1,8 @@
+ISO9660 filesystem was updated to modern standards as of 20/11/2025.
+The changes have - at the time of this writing - not been upstreamed.
+Do compare (and port 'fs/iso9660' over) when updating the Buildroot release.
+
+The following variables are filled in at build-time:
+  - __EFI_ID_FILE__
+  - __KERNEL_PATH__
+  - __INITRD_PATH__ (automatically removed if not used)

fs/iso9660/grub.cfg

@@ -1,12 +1,7 @@
 set default="0"
-set timeout="5"
+set timeout="10"
 
-menuentry "ShredOS" {
-    linux __KERNEL_PATH__ console=tty3 loglevel=3
-    initrd __INITRD_PATH__
-}
-
-menuentry "ShredOS (nomodeset)" {
-    linux __KERNEL_PATH__ console=tty3 loglevel=3 nomodeset
-    initrd __INITRD_PATH__
+menuentry "Buildroot" {
+	linux __KERNEL_PATH__ root=/dev/sr0
+	initrd __INITRD_PATH__
 }

fs/iso9660/isolinux.cfg

@@ -1,15 +1,4 @@
-default menu.c32
-prompt 0
-timeout 50
-
-menu title ShredOS
-
-label shredos
-    menu label ShredOS
+default 1
+label 1
     kernel __KERNEL_PATH__
-    append initrd=__INITRD_PATH__ console=tty3 loglevel=3
-
-label shredos-nomodeset
-    menu label ShredOS (nomodeset)
-    kernel __KERNEL_PATH__
-    append initrd=__INITRD_PATH__ console=tty3 loglevel=3 nomodeset
+    append initrd=__INITRD_PATH__ root=/dev/sr0