Save and document override for private flake

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+# Secret Flake Setup
+
+Create `override.nix` like so, replacing the URL with the absolute path of the repo:
+
+```nix
+{
+  inputs.secrets.url = file:///full-path-to-this-repo/private;
+  outputs = { ... }@inputs: inputs.super;
+}
+```
+
+Then, call `nix flake update --inputs-from override.nix` when updating flakes.