grub-install, grub-mkconfig: add page (#5261)

grub-mkconfig.md

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+# grub-mkconfig
+
+> Generate a GRUB configuration file.
+> More information: <https://www.gnu.org/software/grub/manual/grub/html_node/Invoking-grub_002dmkconfig.html>
+
+- Do a dry run and print the configuration to stdout:
+
+`sudo grub-mkconfig`
+
+- Generate the configuration file:
+
+`sudo grub-mkconfig --output={{/boot/grub/grub.cfg}}`
+
+- Print the help page:
+
+`grub-mkconfig --help`

pages/linux/grub-install.md

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+# grub-install
+
+> Install GRUB to a device.
+> More information: <https://www.gnu.org/software/grub/manual/grub/html_node/Installing-GRUB-using-grub_002dinstall.html>.
+
+- Install GRUB on a BIOS system:
+
+`grub-install --target={{i386-pc}} {{path/to/device}}`
+
+- Install GRUB on an UEFI system:
+
+`grub-install --target={{x86_64-efi}} --efi-directory={{path/to/efi_directory}} --bootloader-id={{GRUB}}`
+
+- Install GRUB pre-loading specific modules:
+
+`grub-install --target={{x86_64-efi}} --efi-directory={{path/to/efi_directory}} --modules="{{part_gpt part_msdos}}"`