feat(nvim): integrate CodeCompanion with LlamaSwap and Copilot

- Remove old code-companion-config.lua file
- Move LLM configuration to llm.lua with LlamaSwap and Copilot integration
- Add copilot-vim plugin to default.nix
- Update which-key bindings to include new CodeCompanion commands
- Configure CodeCompanion with chat, inline, and command strategies using LlamaSwap adapter
- Add memory configuration with default project files
- Update LSP configuration for CodeCompanion markdown rendering

modules/home/programs/terminal/nvim/config/lua/lsp-config.lua

@@ -11,6 +11,13 @@ vim.api.nvim_create_autocmd("FileType", {
 require('render-markdown').setup({
 	completions = { lsp = { enabled = true } },
 	file_types = { 'markdown', 'codecompanion' },
+	html = {
+		-- CodeCompanion Markdown Tweaks
+		tag = {
+			file = { icon = '󰨸 ', highlight = 'Normal' },
+			buf = { icon = '󰂥 ', highlight = 'Normal' },
+		},
+	},
 })
 
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