fix: update landing page to use accessible template and remove duplicate README

- Update landing_main.go to serve accessible_landing.html
- Remove duplicate README.md from output/ directory
- Maintain comprehensive README at top level with full documentation

output/cmd/landing_main.go

@@ -53,7 +53,7 @@ func main() {
 	
 	// Serve landing page
 	r.GET("/", func(c *gin.Context) {
-		c.File("web/templates/landing.html")
+		c.File("web/templates/accessible_landing.html")
 	})
 	
 	// Health check endpoint