doc: notes on SOPS secrets

modules/secrets.nix

@@ -4,12 +4,20 @@
 
     sops = {
       defaultSopsFile = ../secrets/secrets.yaml;
+
+      # NOTE: This thing gave me a huge headache to setup.
+      # If you are ME from future, don't forget to place
+      # your age keys here!
       age.keyFile = "/etc/sops/age/keys.txt";
 
+      # Define secrets to be used.
       secrets = {
+        # Literally the user password.
         "user-password" = {
           neededForUsers = true;
         };
+
+        # SSH private key.
         "ssh-private-key" = {
           path = "/run/secrets/ssh-private-key";
           owner = "zoty";