Update references to the correct default branch.

- Fix broken documentation links
- Fix workflows referencing out-of-date default branches

.github/README.md

@@ -146,7 +146,7 @@ Once you have the **GitHub App** up and running, users will need to add the conf
 - If a default configuration for all repositories in an organization is desirable, create a `.github/rally.yml` file in a repository called `[ORG_NAME]/rally-github-config`. The name of this configuration repository can also be set as an environment variable.
 
 ## How to contribute
-We invite you to contribute to this **GitHub App**! Check out [Issues](https://github.com/github/rally/issues) (especially those labeled `help wanted` or `good first issue`) and jump over to [CONTRIBUTING](https://github.com/github/rally/blob/master/.github/CONTRIBUTING.md) for more details.
+We invite you to contribute to this **GitHub App**! Check out [Issues](https://github.com/github/rally/issues) (especially those labeled `help wanted` or `good first issue`) and jump over to [CONTRIBUTING](https://github.com/github/rally/blob/main/.github/CONTRIBUTING.md) for more details.
 
 ## License
 This project uses the [MIT license](LICENSE)

.github/workflows/build-test.yml

@@ -13,11 +13,11 @@
 #############################
 # Start the job on all push #
 #############################
-# Dont need to run on push to master
+# Dont need to run on push to default branch
 on:
   push:
     branches-ignore:
-      - 'master'
+      - 'main'
 
 ###############
 # Set the Job #
@@ -36,7 +36,7 @@ jobs:
       # Checkout the code base #
       ##########################
       - name: Checkout Code
-        uses: actions/checkout@master
+        uses: actions/checkout@main
 
       ################################
       # Run Linter against code base #

.github/workflows/stack-linter.yml

@@ -13,11 +13,11 @@
 #############################
 # Start the job on all push #
 #############################
-# Dont need to run on push to master
+# Dont need to run on push to default branch
 on:
   push:
     branches-ignore:
-      - 'master'
+      - 'main'
 
 ###############
 # Set the Job #
@@ -36,7 +36,7 @@ jobs:
       # Checkout the code base #
       ##########################
       - name: Checkout Code
-        uses: actions/checkout@master
+        uses: actions/checkout@main
 
       ################################
       # Run Linter against code base #

docs/DockerDeploy.md

@@ -4,7 +4,7 @@ This document will help outline the steps needed to deploy the **Rally + GitHub*
 ## How to Deploy
 
 ### Create GitHub App on GitHub
-You can find all the steps to create the GitHub app from the [README](https://github.com/github/rally/blob/master/.github/README.md) on the root of the source code. You will need the **endpoints**, and `.pem` created to be able to deploy the **GitHub App**.
+You can find all the steps to create the GitHub app from the [README](https://github.com/github/rally/blob/main/.github/README.md) on the root of the source code. You will need the **endpoints**, and `.pem` created to be able to deploy the **GitHub App**.
 
 ### Prepare the source code
 You will first need to clone the source code to your local environment that will run the **Docker** container.