Implement CLI mode and Markdown parsing

- Add CLI mode distinction (gocv vs gocv serve)
- Add goldmark dependency for Markdown parsing
- Create content reading logic from ./content directory
- Implement Markdown to HTML conversion
- Add sample content/index.md for testing
- Update .gitignore for build artifacts

Co-Authored-By: Claude (glm-5) <noreply@anthropic.com>

main.go

@@ -13,15 +13,49 @@ var APP_VERSION string = "latest"
 var COMMIT_ID string = "undefined"
 var ws *WebServer
 
-func main() {
-	// Create a channel to receive the OS signals
-	sc := make(chan os.Signal, 1)
-	signal.Notify(sc, syscall.SIGINT, syscall.SIGTERM)
+const (
+	contentPath = "./content"
+	outputPath  = "./output"
+)
 
+func main() {
 	// Initialize the WebService structure
 	ws = new(WebServer)
 	ws.Initialize()
 
+	// Determine mode based on command line argument
+	// No CLI flags - just check os.Args
+	if len(os.Args) > 1 && os.Args[1] == "serve" {
+		// Serve mode: Start HTTP server with file watching
+		runServeMode()
+	} else {
+		// CLI mode: Generate static files and exit
+		runCLIMode()
+	}
+}
+
+func runCLIMode() {
+	fmt.Println("Running in CLI mode...")
+	fmt.Printf("Reading content from: %s\n", contentPath)
+	fmt.Printf("Writing output to: %s\n", outputPath)
+
+	// Read content and generate output
+	err := generateOutput()
+	if err != nil {
+		fmt.Printf("Error generating output: %s\n", err)
+		os.Exit(1)
+	}
+
+	fmt.Println("Generation complete.")
+}
+
+func runServeMode() {
+	fmt.Println("Running in Serve mode...")
+
+	// Create a channel to receive the OS signals
+	sc := make(chan os.Signal, 1)
+	signal.Notify(sc, syscall.SIGINT, syscall.SIGTERM)
+
 	// Start the WebService in a separate goroutine
 	go ws.Start()