Cleaned up after Aider

New file: lk-installers/install-zellij

@@ -1,7 +0,0 @@
-#!/bin/bash
-
-echo "Installing Zellij via cargo..."
-cargo install zellij || {
-  echo "Cargo failed - trying apt instead"
-  sudo apt update && sudo apt install -y zellij
-}

lk-installers/install-tmux-plugins

@@ -1 +0,0 @@
-git clone https://github.com/tmux-plugins/tpm ~/.config/tmux/plugins/tpm

lk-installers/install-tmux-plugins (DELETED)

@@ -1 +0,0 @@
-# This file has been removed as part of replacing tmux with zellij