contrib: Add Fedora default-kernel scripts

Signed-off-by: Dorian Stoll <dorian.stoll@tmsp.io>

contrib/fedora-default-kernel/README.md

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+# Fedora Default Kernel Updater
+
+This is a small systemd service and path unit that makes sure that the linux-surface kernel is
+always booted by default on Fedora.
+
+The out of the box behaviour is that the newest kernel will be booted by default. This means that
+if the default kernel is ahead of the surface kernel, you have to go into GRUB and change the
+selection every time.
+
+## Installation
+
+```bash
+$ sudo dnf install /usr/sbin/grubby
+$ sudo cp default-kernel.{path,service} /etc/systemd/system/
+$ sudo systemctl daemon-reload
+$ sudo systemctl enable --now default-kernel.path
+```

contrib/fedora-default-kernel/default-kernel.path

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+[Unit]
+Description=linux-surface default kernel watchdog
+
+[Path]
+PathChanged=/boot
+
+[Install]
+WantedBy=default.target

contrib/fedora-default-kernel/default-kernel.service

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+[Unit]
+Description=linux-surface default kernel watchdog
+
+[Service]
+Type=oneshot
+ExecStart=/bin/sh -c "grubby --set-default /boot/vmlinuz*surface*"