Initial Markdown linting (#1978)

.github/workflows/markdownlint.yml

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+
+name: Markdownlint Action
+on: push
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v3
+    - name: Use markdownlint
+      uses: actionshub/markdownlint@v3.1.3
+      with:
+        filesToIgnoreRegex: "CHANGELOG.md|README.md|docs/packaging_guidelines.md|docs/about.md|docs/quick_start.md|docs/index.md|docs/release/gpu_os_support.md|docs/how_to/magma_install/magma_install.md|docs/reference/gpu_libraries/math.md|docs/reference/rocmcc/rocmcc.md|docs/reference/docker.md|docs/reference/hip.md|docs/hip_sdk_install_win/hip_sdk_install_win.md|docs/all_deploy_options.md"

.mdlrc

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+style "mdlrc-style.rb"

mdlrc-style.rb

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+all
+# Extend line length
+rule 'MD013', :line_length => 99999
+
+# Allow in-line HTML
+exclude_rule 'MD033'