Remove copilot chat

lua/custom/plugins/copilot-chat.lua

@@ -1,21 +0,0 @@
-return { -- https://github.com/CopilotC-Nvim/CopilotChat.nvim
-  {
-    'CopilotC-Nvim/CopilotChat.nvim',
-    dependencies = {
-      { 'nvim-lua/plenary.nvim', branch = 'master' },
-    },
-    build = 'make tiktoken',
-    opts = {
-      mappings = {
-        -- Use tab for completion
-        complete = {
-          detail = 'Use @<Tab> or /<Tab> for options.',
-          insert = '',
-        },
-        show_diff = {
-          full_diff = true,
-        },
-      },
-    },
-  },
-}