chore: improved quickstart

QUICKSTART.md

@@ -47,14 +47,26 @@ bin/railiance gen-ssh-key
 
 ### Upload your SSH public key to your cloud provider or VM host
 
-Once your key pair is generated (`~/.ssh/id_ed25519.pub`), copy the public key to the VM.  
+Once your key pair is generated (`~/.ssh/id_<KEY>.pub`), copy the public key to the VM.  
 Replace `<IP>` with your server’s public IP and `<USER>` with the default login user (commonly `ubuntu` or `root`).
 
 ```bash
-scp ~/.ssh/id_ed25519.pub <USER>@<IP>:/home/<USER>/authorized_keys.tmp
+scp ~/.ssh/id_<KEY>.pub <USER>@<IP>:/home/<USER>/authorized_keys.tmp
 ssh <USER>@<IP> "mkdir -p ~/.ssh && cat ~/authorized_keys.tmp >> ~/.ssh/authorized_keys && rm ~/authorized_keys.tmp && chmod 700 ~/.ssh && chmod 600 ~/.ssh/authorized_keys"
 ```
 
+This will:
+
+- copy your public key to the host,
+- append it to ~/.ssh/authorized_keys,
+- set correct permissions.
+
+After this, you should be able to log in without a password:
+
+```bash
+ssh <USER>@<IP>
+```
+
 ---
 
 ## 3. Create your inventory