Revert "Switch from tmux to zellij"

This reverts commit 98a01af1a6.

home/.config/zsh/01-tmux.zsh

@@ -0,0 +1,8 @@
+# Launch tmux if logging in over ssh
+if [[ -z "$TMUX" ]] && [[ -n "$SSH_CONNECTION" ]]; then
+  if tmux has-session -t ssh_tmux 2>/dev/null; then
+    exec tmux -2 attach-session -t ssh_tmux
+  else
+    exec tmux -2 new-session -s ssh_tmux
+  fi
+fi

home/.config/zsh/01-zellij.zsh

@@ -1,4 +0,0 @@
-# Launch zellij if logging in over SSH
-if [[ -z "$ZELLIJ" && -n "$SSH_CONNECTION" ]]; then
-  exec zellij attach -c ssh
-fi