README: don't recommend go get

These days people will just import the packages and the go tool will
do the right thing. We don't need to explain it.

Add a pointer to the git repo, though.

Fixes golang/go#62645

Change-Id: Iea1241d3f6b9ecbe8adaad386a736a1ab39043b1
Reviewed-on: https://go-review.googlesource.com/c/image/+/624115
Auto-Submit: Ian Lance Taylor <iant@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Emmanuel Odeke <emmanuel@orijtech.com>
Reviewed-by: Carlos Amedee <carlos@golang.org>
Commit-Queue: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>

README.md

@@ -2,18 +2,15 @@
 
 [![Go Reference](https://pkg.go.dev/badge/golang.org/x/image.svg)](https://pkg.go.dev/golang.org/x/image)
 
-This repository holds supplementary Go image libraries.
-
-## Download/Install
-
-The easiest way to install is to run `go get -u golang.org/x/image/...`. You can
-also manually git clone the repository to `$GOPATH/src/golang.org/x/image`.
+This repository holds supplementary Go image packages.
 
 ## Report Issues / Send Patches
 
 This repository uses Gerrit for code changes. To learn how to submit changes to
-this repository, see https://golang.org/doc/contribute.html.
+this repository, see https://go.dev/doc/contribute.
+
+The git repository is https://go.googlesource.com/image.
 
 The main issue tracker for the image repository is located at
-https://github.com/golang/go/issues. Prefix your issue with "x/image:" in the
+https://go.dev/issues. Prefix your issue with "x/image:" in the
 subject line, so it is easy to find.