Update ssh.md

Updated key generation to best practice because ssh-rsa is deprecated

Runbooks/ssh.md

@@ -15,7 +15,7 @@ mkdir ~/.ssh && chmod 700~/.ssh
 ### Create SSH keys on your client
 
 ```
-ssh-keygen -t rsa -b 4096 -C "email@domain.com"
+ssh-keygen -t ed25519 -C "email@domain.com"
 ```
 
 ### Copy key to a remote server
@@ -40,4 +40,4 @@ Note about git: I have noticed that you need to generate keys for both your user
 
 ### Login to remote server using your key
 
-`ssh username@ip_address`
+`ssh username@ip_address`