Update DEVELOPMENT.md - fix broken link

Removed in tektoncd/pipeline#8429

DEVELOPMENT.md

@@ -45,7 +45,7 @@ This project extends Kubernetes (aka `k8s`) with Custom Resource Definitions
 - [Tekton Pipelines README](https://github.com/tektoncd/pipeline/blob/master/docs/README.md) -
   Some of the terms here may make more sense!
 - Install via
-  [official installation docs](https://github.com/tektoncd/pipeline/blob/master/docs/install.md)
+  [official installation docs](https://tekton.dev/docs/getting-started)
   or continue through [getting started for development](#getting-started)
 - [Tekton Pipeline "Hello World" tutorial](https://github.com/tektoncd/pipeline/blob/master/docs/tutorial.md) -
   Define `Tasks`, `Pipelines`, and `PipelineResources`, see what happens when
@@ -364,4 +364,4 @@ with a clear message explaining why it was skipped.
 flag to `alpha` in your test cluster to see your alpha integration tests
 run. When the flag in your cluster is `alpha` _all_ integration tests are executed,
 both `stable` and `alpha`. Setting the feature flag to `stable` will exclude `alpha`
-tests.
+tests.