update htmlproofer to use my action (#195)

.github/workflows/test.yml

@@ -42,9 +42,6 @@ jobs:
       - name: Build Docs
         run: ./build.sh
       - name: Test html
-        uses: chabad360/htmlproofer@v1.1
+        uses: athackst/htmlproofer-action@main
         with:
           directory: "./site"
-          # BANDAID: 404.html site not rendering with correct links
-          # BANDAID: twitter profile has 400 error
-          arguments: --url-ignore https://fonts.gstatic.com,https://twitter.com/althack --allow-hash-href --file-ignore ./site/404.html --internal-domains "${{ github.repository_owner }}.github.io/${{ github.event.repository.name }}"

CONTRIBUTING.md

@@ -4,7 +4,7 @@ First off, thanks for taking the time to contribute! :rocket:
 
 ## The Basics
 
-If you are looking to help with a code contribution, this project uses [MKDocs](https://www.mkdocs.org/) for documentation generation, [Python](https://www.python.org/) for the plugin, along with a splattering of [Markdown](https://www.markdownguide.org/) and [ShellScript](https://en.wikipedia.org/wiki/Shell_script).  I've included my [VSCode](https://code.visualstudio.com/) workspace and a [Docker](https://docs.docker.com/) development container.  Read about [how I develop using VSCode and Docker](http://www.allisonthackston.com/articles/docker_development.html). If you don't feel ready to make a code contribution yet, no problem! You can also check out the issues we have in the [Github issue tracker](https://github.com/athackst/mkdocs-simple-plugin/issues).
+If you are looking to help with a code contribution, this project uses [MKDocs](https://www.mkdocs.org/) for documentation generation, [Python](https://www.python.org/) for the plugin, along with a splattering of [Markdown](https://www.markdownguide.org/) and [ShellScript](https://en.wikipedia.org/wiki/Shell_script).  I've included my [VSCode](https://code.visualstudio.com/) workspace and a [Docker](https://docs.docker.com/) development container.  Read about [how I develop using VSCode and Docker](https://www.allisonthackston.com/articles/docker_development.html). If you don't feel ready to make a code contribution yet, no problem! You can also check out the issues we have in the [Github issue tracker](https://github.com/athackst/mkdocs-simple-plugin/issues).
 
 <!-- TODO
 If you are interested in making a code contribution and would like to learn more about the technologies that this project uses, check out the list below.