(PUP-8200) Update README.md

README.md

@@ -25,10 +25,10 @@ which also includes orchestration features, a web console, and professional supp
 The PE documentation is [available here.](https://puppet.com/docs/pe/latest)
 
 To install an open source release of Puppet,
-[see the installation guide on the docs site.](https://puppet.com/docs/puppet/5.5/install_pre.html)
+[see the installation guide on the docs site.](https://puppet.com/docs/puppet/latest/installing_and_upgrading.html)
 
 If you need to run Puppet from source as a tester or developer,
-see the [Running Puppet from Source](https://docs.puppet.com/puppet/3.8/from_source.html) guide on the docs site.
+see the [Quick Start to Developing on Puppet](docs/quickstart.md) guide.
 
 ## Developing and Contributing