Add Purism Librem 13v3 profile

purism/librem/13v3/README.md

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+Librem comes with Coreboot + SeaBIOS payload. That means EFI boot is not
+possible. Use `fdisk` to partition hard drive, and GRUB as a bootloader:
+
+```nix
+{
+  boot.loader.grub = {
+    enable = true;
+    device = "/dev/sda";
+    version = 2;
+  };
+}
+```

purism/librem/13v3/default.nix

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+{
+  imports = [
+    ../../../common/cpu/intel
+    ../../../common/pc/laptop
+  ];
+
+  # https://github.com/systemd/systemd/pull/9318
+  services.udev.extraHwdb = ''
+    # Purism Librem 13 V3
+    evdev:atkbd:dmi:bvn*:bvr*:bd*:svnPurism*:pn*Librem13v3*:pvr*
+     KEYBOARD_KEY_56=backslash
+  '';
+}