tour: fix instructions to run locally

Since the golang/tour repository was emptied and the tour content
moved to x/website/tour, go-getting golang.org/x/tour no longer works.
This change updates the instructions to run the tour locally, both in
the tour welcome page and in the repository's README.

It also updates the pkg.go.dev badge link.

Fixes golang/tour#1203

Change-Id: I1591e790ff3821dea4304f38a7ebc7867da585a6
Reviewed-on: https://go-review.googlesource.com/c/website/+/326330
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
Run-TryBot: Alberto Donizetti <alb.donizetti@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
diff --git a/tour/README.md b/tour/README.md
index 7ddefc5..2713de6 100644
--- a/tour/README.md
+++ b/tour/README.md
@@ -1,6 +1,6 @@
 # Go Tour
 
-[![Go Reference](https://pkg.go.dev/badge/golang.org/x/tour.svg)](https://pkg.go.dev/golang.org/x/tour)
+[![Go Reference](https://pkg.go.dev/badge/golang.org/x/website/tour.svg)](https://pkg.go.dev/golang.org/x/website/tour)
 
 A Tour of Go is an introduction to the Go programming language. Visit
 https://tour.golang.org to start the tour.
@@ -10,10 +10,10 @@
 To install the tour from source, first
 [install Go](https://golang.org/doc/install) and then run:
 
-	$ go get golang.org/x/tour
+	$ go install golang.org/x/website/tour@latest
 
 This will place a `tour` binary in your
-[workspace](https://golang.org/doc/code.html#Workspaces)'s `bin` directory.
+[GOPATH](https://golang.org/cmd/go/#hdr-GOPATH_and_Modules)'s `bin` directory.
 The tour program can be run offline.
 
 ## Contributing
@@ -36,7 +36,7 @@
 this repository, see https://golang.org/doc/contribute.html.
 
 The issue tracker for the tour's code is located at https://github.com/golang/go/issues.
-Prefix your issue with "x/tour:" in the subject line, so it is easy to find.
+Prefix your issue with "x/website/tour:" in the subject line, so it is easy to find.
 
 Issues with the tour's content itself should be reported in the issue tracker
 at https://github.com/golang/tour/issues.
diff --git a/tour/content/welcome.article b/tour/content/welcome.article
index e96256a..d9cfd88 100644
--- a/tour/content/welcome.article
+++ b/tour/content/welcome.article
@@ -70,10 +70,10 @@
 #appengine: To run the tour locally, you'll need to first
 #appengine: [[https://golang.org/doc/install][install Go]] and then run:
 #appengine:
-#appengine:   go get golang.org/x/tour
+#appengine:   go install golang.org/x/website/tour@latest
 #appengine:
 #appengine: This will place a `tour` binary in your
-#appengine: [[https://golang.org/doc/code.html#Workspaces][workspace]]'s `bin` directory.
+#appengine: [[https://golang.org/cmd/go/#hdr-GOPATH_and_Modules][GOPATH]]'s `bin` directory.
 #appengine: When you run the tour program, it will open a web browser displaying
 #appengine: your local version of the tour.
 #appengine: