Housekeeping

- Update README
- Run shellcheck on .sh files
- Add helper scripts
- Remove eirene vm variant
- Add post-install checklist

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

scripts/remove-host.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+if [[ "$#" -ne 2 ]]; then
+  echo "Usage: $0 <host> <sops-master-key>"
+  exit 1
+fi
+
+HOST="$1"
+
+AGE_KEY=$(nix shell nixpkgs#ssh-to-age --command bash -c "cat './hosts/${HOST}/secrets/ssh_host_ed25519_key.pub' | ssh-to-age")
+
+for SOPS_FILE in $(find . -type f -name "sops.yaml"); do
+  sed -i "/    - &${HOST} ${AGE_KEY}/d" "${SOPS_FILE}"
+  sed -i "/        - \*${HOST}/d" "${SOPS_FILE}"
+done
+
+sed -i "/${HOST}.publicKeyFile/d" ./hosts/common/system/configs/ssh/default.nix
+
+"$(dirname "$0")/update-keys.sh" "$2"
+
+rm -rf "./hosts/${HOST}"
+
+echo "Host ${HOST} has been successfully removed."
+echo "Please remove SSH key pairs for any users that used to connect to this host."