Remove ssh agent stuff due to adding plugin

.zshrc

@@ -1,26 +1,3 @@
-# ssh key loading.
-env=~/.ssh/agent.env
- 
-agent_load_env () { test -f "$env" && . "$env" >| /dev/null ; }
- 
-agent_start () {
-    (umask 077; ssh-agent >| "$env")
-    . "$env" >| /dev/null ; }
- 
-agent_load_env
- 
-# agent_run_state: 0=agent running w/ key; 1=agent w/o key; 2= agent not running
-agent_run_state=$(ssh-add -l >| /dev/null 2>&1; echo $?)
- 
-if [ ! "$SSH_AUTH_SOCK" ] || [ $agent_run_state = 2 ]; then
-    agent_start
-    ssh-add
-elif [ "$SSH_AUTH_SOCK" ] && [ $agent_run_state = 1 ]; then
-    ssh-add
-fi
- 
-unset env
-
 # Enable Powerlevel10k instant prompt. Should stay close to the top of ~/.zshrc.
 # Initialization code that may require console input (password prompts, [y/n]
 # confirmations, etc.) must go above this block; everything else may go below.