docs: n34 book

Signed-off-by: Awiteb <a@4rs.nl>

docs/config/bunker.md

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+# NIP-46 Bunker
+
+> `n34 config bunker` command
+
+**Usage:**
+```
+Sets a URL of NIP-46 bunker server used for signing events
+
+Usage: n34 config bunker [BUNKER_URL]
+
+Arguments:
+  [BUNKER_URL]  Nostr Connect URL for the bunker. Omit this to remove the current bunker URL
+```
+
+This command configures `n34` to use a remote signer ([NIP-46]), known as a
+bunker, for all cryptographic operations.
+
+When `n34` communicates with the bunker, it uses a persistent, locally-generated
+keypair. You should add this keypair's public key to your bunker's list of
+authorized applications. This allows `n34` to operate securely without needing
+direct access to your main private key.
+
+Once configured, actions such as fetching your public key or signing events are
+delegated to the bunker. To remove the bunker configuration, run the command
+again without providing a URL.
+
+[NIP-46]: https://github.com/nostr-protocol/nips/blob/master/46.md