chore(ssh): remove unused SSH environment and config files

private_dot_ssh/agent.env.fish

@@ -1,2 +0,0 @@
-set -gx SSH_AUTH_SOCK /home/prad/.ssh/agent/s.QldBLEwIHk.agent.b0pl1pJ67t
-set -gx SSH_AGENT_PID 972955

private_dot_ssh/private_config

@@ -1,15 +0,0 @@
-# known_hosts
-Host github
-  HostName github.com
-
-Host goliath
-  HostName 192.168.1.68
-  User prad
-  SetEnv TERM=xterm-256color
-  ControlMaster auto
-  ControlPath ~/.ssh/cm-%r@%h:%p
-  ControlPersist 10m
-
-Host kvm8-prod
-  HostName walletbase.host
-  User root