feat: replace Handler() method for HTTPServeMux() for better plugin and testing integration; remove via-plugin-picocss dependency from examples; add datastar h.H nodes for data-init, data-effect, and data-ignore-morph; update realtimechart example; other small improvements

internal/examples/picocss/main.go

@@ -2,7 +2,7 @@ package main
 
 import (
 	"github.com/go-via/via"
-	"github.com/go-via/via-plugin-picocss/picocss"
+	// "github.com/go-via/via-plugin-picocss/picocss"
 	"github.com/go-via/via/h"
 )
 
@@ -15,9 +15,9 @@ func main() {
 		DocumentTitle: "Via Counter",
 		// Plugin is placed here. Use picocss.WithOptions(pococss.Options) to add the plugin
 		// with a different color theme or to enable a classes for a wide range of colors.
-		Plugins: []via.Plugin{
-			picocss.Default,
-		},
+		// Plugins: []via.Plugin{
+		// 	picocss.Default,
+		// },
 	})
 
 	v.Page("/", func(c *via.Context) {