README: add 'Infrastructure' section

Signed-off-by: Trevor Gamblin <tgamblin@baylibre.com>

Author: threexc

README.md

@@ -46,3 +46,7 @@ Under Construction
 ## Contributing
 
 Under Construction
+
+## Infrastructure
+
+See [infrastructure.md](docs/infrastructure.md)

docs/infrastructure.md

@@ -16,19 +16,21 @@ guide](https://riscv-runners.riseproject.dev/docs/getting-started/install).
 ## GitLab
 
 The `python-wheels` project is a continuation of
-[wheel_builder](https://gitlab.com/riseproject/python/wheel_builder), which is
-hosted on GitLab. This project leverages the GitLab CI/CD framework to create
-pipelines for building, testing, and deploying wheels, along with automatic
-documentation updates and periodic checks for new package versions upstream.
+[wheel_builder](https://riseproject.gitlab.io/python/wheel_builder/index.html),
+which is hosted on GitLab. This project leverages the GitLab CI/CD framework to
+create pipelines for building, testing, and deploying wheels, along with
+automatic documentation updates and periodic checks for new package versions
+upstream.
 
 While development and maintenance now primarily occur on GitHub, the existing
 GitLab infrastructure (particularly the package registry) must be maintained.
 
 ### GitLab for Open Source
 
 We apply for the [GitLab for Open
-Source](https://about.gitlab.com/solutions/open-source/join/) program.
-Membership requires annual renewal.
+Source](https://about.gitlab.com/solutions/open-source/join/) program.  This
+provides us with the GitLab Ultimate Plan at no cost. Membership requires annual
+renewal.
 
 ### CI/CD Pipeline Tokens and Access