Add js web stuff to landing page + documentation

go/cmd/kjol-web/build/main.go

@@ -0,0 +1,42 @@
+// Command build runs the example's full pre-compile step once: directive codegen,
+// Tailwind, the wasm binary, and Go's JS shim.
+//
+//	go run ./build      # from go/cmd/kjol-web
+//
+// For day-to-day work run the dev server instead (`go run ./server`) — it performs
+// these same steps on every save and hot-swaps the result into the browser. This
+// command is for a cold build, CI, or an editor's pre-launch task.
+package main
+
+import (
+	"log"
+	"os"
+
+	"kjolweb/buildsteps"
+)
+
+func main() {
+	log.SetFlags(0)
+
+	steps := []struct {
+		name string
+		run  func() ([]byte, error)
+	}{
+		{"generating directive glue (//gowasm:page, //gowasm:layout, //gowasm:server)", buildsteps.Codegen},
+		{"compiling Tailwind CSS -> wwwroot/app.css", buildsteps.Tailwind},
+		{"compiling ./wasm -> wwwroot/app.wasm (GOOS=js GOARCH=wasm)", buildsteps.Wasm},
+		{"bundling the Solid half -> wwwroot/bundle.min.{js,css} (TSX -> Solid -> esbuild)", buildsteps.JS},
+		{"copying Go's wasm_exec.js shim into wwwroot/", buildsteps.Shim},
+	}
+
+	for _, s := range steps {
+		log.Println("==>", s.name)
+		if out, err := s.run(); err != nil {
+			os.Stderr.Write(out)
+			log.Fatalln("build failed:", err)
+		}
+	}
+
+	log.Println("==> Done. Run the server with:  go run ./server")
+	log.Println("    then open http://localhost:8085")
+}