website: Updated URLs to the stable branch

The master branch is to be deprecated in gem5 20.1.

Change-Id: Ib24957f690de149e08c66b697fbd8d2596b2671a
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/35436
Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu>
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Tested-by: Bobby R. Bruce <bbruce@ucdavis.edu>
diff --git a/_pages/documentation/general_docs/building/index.md b/_pages/documentation/general_docs/building/index.md
index 42d84fa..0321993 100644
--- a/_pages/documentation/general_docs/building/index.md
+++ b/_pages/documentation/general_docs/building/index.md
@@ -92,18 +92,18 @@
 Ubuntu 18.04 with all optional dependencies (Python 2):
 [gcr.io/gem5-test/ubuntu-18.04_all-dependencies](
 https://gcr.io/gem5-test/ubuntu-18.04_all-dependencies) ([source Dockerfile](
-https://gem5.googlesource.com/public/gem5/+/refs/heads/master/util/dockerfiles/ubuntu-18.04_all-dependencies/Dockerfile)).
+https://gem5.googlesource.com/public/gem5/+/refs/heads/stable/util/dockerfiles/ubuntu-18.04_all-dependencies/Dockerfile)).
 
 Ubuntu 18.04 with the minimum set of dependencies (Python 2):
 [gcr.io/gem5-test/ubuntu-18.04_min-dependencies](
 https://gcr.io/gem5-test/ubuntu-18.04_min-dependencies) ([source Dockerfile](
-https://gem5.googlesource.com/public/gem5/+/refs/heads/master/util/dockerfiles/ubuntu-18.04_min-dependencies/Dockerfile)).
+https://gem5.googlesource.com/public/gem5/+/refs/heads/stable/util/dockerfiles/ubuntu-18.04_min-dependencies/Dockerfile)).
 
 
 Ubuntu 20.04 with all optional dependencies (Python 3):
 [gcr.io/gem5-test/ubuntu-20.04_all-dependencies](
 https://gcr.io/gem5-test/ubuntu-20.04_all-dependencies) ([source Dockerfile](
-https://gem5.googlesource.com/public/gem5/+/refs/heads/master/util/dockerfiles/ubuntu-20.04_all-dependencies/Dockerfile)).
+https://gem5.googlesource.com/public/gem5/+/refs/heads/stable/util/dockerfiles/ubuntu-20.04_all-dependencies/Dockerfile)).
 
 To obtain a docker image:
 
diff --git a/_pages/governance.md b/_pages/governance.md
index b3b69d2..a2ebbe6 100644
--- a/_pages/governance.md
+++ b/_pages/governance.md
@@ -104,7 +104,7 @@
 
 The project management committee consists of those individuals identified as ‘project owners’ on the development site. The PMC has additional responsibilities over and above those of a committer. These responsibilities ensure the smooth running of the project. PMC members are expected to review code contributions, participate in strategic planning, approve changes to the governance model and manage how the software is distributed and licensed.
 
-Some PMC members are responsible for specific components of the gem5 project. This includes gem5 source modules (e.g., classic caches, O3CPU model, etc.) and project assets (e.g., the website). A list of the current components and the responsible members can be found within the [MAINTAINERS](https://gem5.googlesource.com/public/gem5/+/refs/heads/master/MAINTAINERS) document.
+Some PMC members are responsible for specific components of the gem5 project. This includes gem5 source modules (e.g., classic caches, O3CPU model, etc.) and project assets (e.g., the website). A list of the current components and the responsible members can be found within the [MAINTAINERS](https://gem5.googlesource.com/public/gem5/+/refs/heads/stable/MAINTAINERS) document.
 
 Members of the PMC do not have significant authority over other members of the community, although it is the PMC that votes on new committers. It also makes decisions when community consensus cannot be reached. In addition, the PMC has access to the project’s private mailing list. This list is used for sensitive issues, such as votes for new committers and legal matters that cannot be discussed in public. It is never used for project management or planning.
 
diff --git a/_posts/2020-02-25-gem5-19.md b/_posts/2020-02-25-gem5-19.md
index 1efff21..54947d1 100644
--- a/_posts/2020-02-25-gem5-19.md
+++ b/_posts/2020-02-25-gem5-19.md
@@ -65,7 +65,7 @@
 ## FAQ about the release
 
 Below, I'd like to answer a few common questions about this release.
-You can find all of the details about our release process in the [Contributing document](https://gem5.googlesource.com/public/gem5/+/refs/heads/master/CONTRIBUTING.md#releases).
+You can find all of the details about our release process in the [Contributing document](https://gem5.googlesource.com/public/gem5/+/refs/heads/stable/CONTRIBUTING.md#releases).
 
 ### Why releases?
 
diff --git a/_posts/2020-05-03-season-of-docs.md b/_posts/2020-05-03-season-of-docs.md
index 349ca06..9e88362 100644
--- a/_posts/2020-05-03-season-of-docs.md
+++ b/_posts/2020-05-03-season-of-docs.md
@@ -82,7 +82,7 @@
 of whom need taught how to follow our contribution procedures. Typically we
 direct wannabe contributors to our [contribution guidelines](
 http://www.gem5.org/contributing) and our [CONTRIBUTION.md](
-https://gem5.googlesource.com/public/gem5/+/refs/heads/master/CONTRIBUTING.md)
+https://gem5.googlesource.com/public/gem5/+/refs/heads/stable/CONTRIBUTING.md)
 document. As with our Learning gem5 documentation, we would like this
 investigated and improved upon if need be.
 
diff --git a/_posts/2020-05-21-gem5-20.md b/_posts/2020-05-21-gem5-20.md
index 25c40f9..50c2399 100644
--- a/_posts/2020-05-21-gem5-20.md
+++ b/_posts/2020-05-21-gem5-20.md
@@ -6,8 +6,8 @@
 categories: project
 ---
 
-After much waiting, and a few surprising issues, [gem5-20.0](https://gem5.googlesource.com/public/gem5/+/refs/heads/master) has been released!
-The [master](https://gem5.googlesource.com/public/gem5/+/refs/heads/master) branch of the gem5 repo now points to the gem5-20 release instead of the gem5-19 release.
+After much waiting, and a few surprising issues, [gem5-20.0](https://gem5.googlesource.com/public/gem5/+/refs/heads/stable) has been released!
+The [master](https://gem5.googlesource.com/public/gem5/+/refs/heads/stable) branch of the gem5 repo now points to the gem5-20 release instead of the gem5-19 release.
 
 Thank you to everyone that made this release possible!
 This has been a very productive release with [84 issues](https://gem5.atlassian.net/), about 500 commits, and 30 unique contributors.