[BEAM-8956] Begin unifying contributor instructions into a single loc…

…ation

README.md

@@ -83,20 +83,8 @@ Have ideas for new Runners? See the [JIRA](https://issues.apache.org/jira/issues
 
 ## Getting Started
 
-Please refer to the Quickstart[[Java](https://beam.apache.org/get-started/quickstart-java), [Python](https://beam.apache.org/get-started/quickstart-py), [Go](https://beam.apache.org/get-started/quickstart-go)] available on our website.
-
-If you'd like to build and install the whole project from the source distribution, you may need some additional tools installed
-in your system. In a Debian-based distribution:
-
-```
-sudo apt-get install \
- openjdk-8-jdk \
- python-setuptools \
- python-pip \
- virtualenv
-```
-
-Then please use the standard `./gradlew build` command.
+To learn how to write Beam pipelines, read the Quickstart for [[Java](https://beam.apache.org/get-started/quickstart-java), [Python](https://beam.apache.org/get-started/quickstart-py), or 
+[Go](https://beam.apache.org/get-started/quickstart-go)] available on our website.
 
 ## Contact Us
 
@@ -106,11 +94,12 @@ To get involved in Apache Beam:
 * [Subscribe](mailto:[email protected]) or [mail](mailto:[email protected]) the [[email protected]](http:https://mail-archives.apache.org/mod_mbox/beam-dev/) list.
 * Report issues on [JIRA](https://issues.apache.org/jira/browse/BEAM).
 
-We also have a [contributor's guide](https://beam.apache.org/contribute/contribution-guide/).
+Instructions for building and testing Beam itself
+are in the [contribution guide](https://beam.apache.org/contribute/).
 
 ## More Information
 
-* [Apache Beam](http:https://beam.apache.org)
-* [Overview](http:https://beam.apache.org/use/beam-overview/)
+* [Apache Beam](https:https://beam.apache.org)
+* [Overview](https:https://beam.apache.org/use/beam-overview/)
 * Quickstart: [Java](https://beam.apache.org/get-started/quickstart-java), [Python](https://beam.apache.org/get-started/quickstart-py), [Go](https://beam.apache.org/get-started/quickstart-go)
 * [Community metrics](https://s.apache.org/beam-community-metrics)

website/src/contribute/index.md

@@ -67,14 +67,38 @@ To contribute code, you need
 
  - a GitHub account
  - a Linux, macOS, or Microsoft Windows development environment with Java JDK 8 installed
- - [Docker](https://www.docker.com/) installed for some tasks including building worker containers and testing website
+ - [Docker](https://www.docker.com/) installed for some tasks including building worker containers and testing this website
  changes locally
- - [Go](https://golang.org) 1.10 or later installed for Go SDK development
- - Python, virtualenv, and tox installed for Python SDK development
+ - [Go](https://golang.org) 1.12 or later installed for Go SDK development
+ - Python 2.7, 3.5, 3.6, and 3.7. Yes, you need all four versions installed.
+ - pip, setuptools, virtualenv, and tox installed for Python development
  - for large contributions, a signed [Individual Contributor License
  Agreement](https://www.apache.org/licenses/icla.pdf) (ICLA) to the Apache
  Software Foundation (ASF).
 
+To install these in a Debian-based distribution:
+
+```
+sudo apt-get install \
+ openjdk-8-jdk \
+ python-setuptools \
+ python-pip \
+ virtualenv \
+ tox \
+ docker-ce
+```
+
+You also need to [install Go](https://golang.org/doc/install]).
+
+Once Go is installed, install goavro:
+
+```
+$ export GOPATH=`pwd`/sdks/go/examples/.gogradle/project_gopath
+$ go get github.com/linkedin/goavro
+```
+
+gLinux users should configure their machines for sudoless Docker.
+
 ### Connect With the Beam community
 
 1. Consider subscribing to the [dev@ mailing list]({{ site.baseurl}}/community/contact-us/), especially
@@ -182,7 +206,7 @@ To contribute code, you need
 1. If you don't get any response in 3 business days, email the [dev@ mailing list]({{ site.baseurl }}/community/contact-us) to ask for someone to look at your pull
  request.
 
-### Make reviewer's job easier
+### Make the reviewer's job easier
 
 1. Provide context for your changes in the associated JIRA issue and/or PR description.