Add tmux config and replace zellij with tmux in zshrc.

Zhrc also has some light refactoring, and has added a zsh local file
which gets sourced if it exists, useful for adding local environment
variables

home/.config/tmux/tmux-fuzzy-find-session.sh

@@ -0,0 +1,45 @@
+#!/bin/zsh
+
+# Run fzf-tmux in the background and serialize the input
+(
+current_session=$(tmux display-message -p '#S')
+selected=$(tmux list-sessions -F '#S' | grep -v "$current_session" | fzf-tmux -p --expect=enter,del --header="Tmux Sessions (Ent/Del)")
+echo "$selected" > /tmp/fzf-tmux-target
+tmux refresh-client -S
+) &
+
+# Give some time for fzf to initiate and display
+sleep 0.1
+tmux refresh-client -S
+
+# Wait for the fzf-tmux process to complete
+wait
+
+# Read the serialized input
+selected=$(cat /tmp/fzf-tmux-target)
+rm /tmp/fzf-tmux-target
+key=$(head -n1 <<< "$selected")
+target=$(tail -n +2 <<< "$selected")
+
+# Check the pressed key and take appropriate action
+case "$key" in
+    enter)
+        if [ -n "$target" ]; then
+            tmux switch-client -t "$target"
+            tmux display-message "Switched to session: $target"
+        else
+            tmux display-message "No session selected"
+        fi
+        ;;
+    del)
+        if [ -n "$target" ]; then
+            tmux kill-session -t "$target"
+            tmux display-message "Deleted session: $target"
+        else
+            tmux display-message "No session selected"
+        fi
+        ;;
+    *)
+        tmux display-message "Action cancelled"
+        ;;
+esac