internal/tour: fix go.dev/tour

The playground js was coming from
godoc instead of the updated copy in go.dev.

Change-Id: I26be8634b0e5d453b966be758f08c15b4bc7ca72
Reviewed-on: https://go-review.googlesource.com/c/website/+/366376
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Website-Publish: Russ Cox <rsc@golang.org>

content.go

@@ -23,7 +23,10 @@ func TourOnly() fs.FS {
 //go:embed _content
 var embedded embed.FS
 
-//go:embed _content/tour _content/favicon.ico _content/images/go-logo-white.svg
+//go:embed _content/favicon.ico
+//go:embed _content/images/go-logo-white.svg
+//go:embed _content/js/playground.js
+//go:embed _content/tour
 var tourOnly embed.FS
 
 func subdir(fsys fs.FS, path string) fs.FS {

internal/tour/tour.go

@@ -19,7 +19,6 @@ import (
 	"strings"
 	"time"
 
-	"golang.org/x/tools/godoc/static"
 	"golang.org/x/tools/present"
 	"golang.org/x/website"
 )
@@ -231,14 +230,9 @@ func initScript(mux *http.ServeMux, socketAddr, transport string) error {
 	modTime := time.Now()
 	b := new(bytes.Buffer)
 
-	content, ok := static.Files["playground.js"]
-	if !ok {
-		return fmt.Errorf("playground.js not found in static files")
-	}
-	b.WriteString(content)
-
 	// Keep this list in dependency order
 	files := []string{
+		"../js/playground.js",
 		"static/lib/jquery.min.js",
 		"static/lib/jquery-ui.min.js",
 		"static/lib/angular.min.js",
@@ -253,7 +247,7 @@ func initScript(mux *http.ServeMux, socketAddr, transport string) error {
 	}
 
 	for _, file := range files {
-		f, err := fs.ReadFile(contentTour, "tour/"+file)
+		f, err := fs.ReadFile(contentTour, path.Clean("tour/"+file))
 		if err != nil {
 			return err
 		}