Address peer review requests

Author: James Sansbury

CONTRIBUTING.md

@@ -1,23 +1,15 @@
-## Contributing to this repository
+# Contributing to this repository
 
 1. Don't edit the Dockerfiles directly. They are generated using templates.
 2. Make any changes to the `*.template` files in the root of the repository.
 3. Make sure you've checked the [Requirements](#requirements) below.
 4. Run the `./apply-templates.sh` script after making your changes.
-5. Once complete, commit all changes to the templates and Dockerfiles.
+5. Once complete, (review and) commit all changes to the templates and Dockerfiles.
 
 ## Requirements
 
-You will need [Gnu Awk](https://www.gnu.org/software/gawk/) to generate the Dockerfiles from the templates.
+You will need the following software packages to run the [`./apply-templates.sh`](/apply-templates.sh) script.
 
-To install Gnu Awk on Debian-flavors of Linux:
-
-```
-$ apt-get update && apt-get install gawk
-```
-
-To install Gnu Awk on Mac/Linux/Windows with [Homebrew](https://brew.sh/):
-
-```
-$ brew install gawk
-```
+- [Gnu Awk](https://www.gnu.org/software/gawk/) available as `gawk`.
+- [`jq`](https://stedolan.github.io/jq/)
+- A recent version of Bash