docs: n34 book

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

docs/config/relays.md

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+# Fallback Relays
+
+> `n34 config relays` command
+
+**Usage:**
+```
+Sets the default fallback relays if none provided. Use this relays for read and write
+
+Usage: n34 config relays [OPTIONS] [RELAYS]...
+
+Arguments:
+  [RELAYS]...  List of relay URLs to append to fallback relays. If empty, removes all fallback relays
+
+Options:
+      --override  Replace existing fallback relays instead of appending new ones
+```
+
+This command configures the default fallback relays, which `n34` uses to read
+from and write to. To add relays, provide their URLs as arguments to append
+them to the current list. Use the `--override` flag to replace the existing list
+entirely. To clear all fallback relays, run the command without any arguments.