Include copilot chat and completions.

Refactor configuration into more modules

.config/nvim/lua/plugins/llm.lua

@@ -0,0 +1,31 @@
+return {
+	{
+		"github/copilot.vim",
+	},
+	{
+		"CopilotC-Nvim/CopilotChat.nvim",
+		tag = "v3.4.0",
+		dependencies = {
+			{ "nvim-lua/plenary.nvim" },
+			{ "github/copilot.vim" },
+		},
+		build = "make tiktoken",
+		config = function()
+			require("CopilotChat").setup({
+				question_header = "",
+				answer_header = "",
+				separator = "",
+				error_header = "> [!ERROR] Error",
+				window = {
+					layout = "horizontal",
+					height = 0.3,
+					width = 0.25,
+				},
+				auto_insert_mode = false,
+				chat_autocomplete = false,
+				highlight_headers = false,
+				show_help = false,
+			})
+		end,
+	},
+}