create linode bootstrap readme doc

hosts/linode/readme.md

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+# Linode setup
+
+<https://www.linode.com/docs/guides/install-nixos-on-linode/#prepare-your-linode>
+<https://nixos.org/download/>
+
+- shutdown linode
+- delete existing disks and configuration profiles
+- Create Disks
+  - `installer`: `ext4` `1280 MB`
+  - `swap`: `swap` `512 MB`
+  - `nixos`: `ext4` all remaining space
+- Create two configuration profiles, one for the installer and one to boot NixOS. For each profile, disable all of the options under Filesystem/Boot Helpers and set the Configuration Profile to match the following:
+  - installer profile
+    - Label: installer
+    - Kernel: Direct Disk
+    - /dev/sda: nixos
+    - /dev/sdb: swap
+    - /dev/sdc: installer
+    - root / boot device: Standard: `/dev/sdc`
+  - nixos profile
+    - Label: nixos
+    - Kernel: GRUB 2
+    - /dev/sda: nixos
+    - /dev/sdb: swap
+    - root / boot device: Standard: `/dev/sda`
+- Setup installer.
+  - rescue mode with installer as /dev/sda
+  - Open LISH
+
+```bash
+# Update SSL certificates to allow HTTPS connections:
+update-ca-certificates
+# set the iso url to a variable
+iso=https://channels.nixos.org/nixos-24.11/latest-nixos-minimal-x86_64-linux.iso
+# verify sda disk is installer (~1GB)
+lsblk
+curl -L https://channels.nixos.org/nixos-24.11/latest-nixos-minimal-x86_64-linux.iso.sha256
+# Download the ISO, write it to the installer disk, and verify the checksum:
+curl -L $iso | tee >(dd of=/dev/sda) | sha256sum
+# verify the shas are the same then shutdown system
+shutdown 0
+```
+
+- Boot the installer configuration profile and install nixos
+(open GLISH and `sudo -i && passwd #simple pass` ssh into machine for easier copy paste, rerun `passwd` with a more secure password here if desired)
+  - mount /dev/sda /mnt
+  - swapon /dev/sdb
+  - nixos-generate-config --root /mnt
+  - cd /mnt/etc/nixos
+
+- # TODO rewrite device modifiers like they say in the tutorial? I had issues with linode's device labeling so I am leaving it to uuids, this could bite me in the future idk
+
+  - copy `linode.nix` into remote server and import it into `configuration.nix`
+    - update ssh key for root user if needed
+  - `nixos-install`
+  - `shutdown 0`
+- delete the installer configuration profile in linode, boot into nixos configuration profile
+
+tada, should be able to ssh with root and ssh key defined in earlier in linode.nix