Adding a GitHub Action to check for broken links

Signed-off-by: A.Arnold <anarnold@redhat.com>

Author: anarnold97

.github/workflows/ISSUE_TEMPLATE.md

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+---
+title: Website Contains Broken Links
+labels: ''
+assignees: 'anarnold97'
+---
+
+## Broken Links Detected
+
+Broken Link Checker found broken links:
+
+[View Results](https://github.com/migtools/mta-documentation/actions/workflows/check-broken-links.yml)
+
+_Use search filter `─BROKEN─` to highlight failures_

.github/workflows/broken-link-check.yml

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+on:
+  schedule:
+    - cron: '12 1 * * 5' # run monthly
+  repository_dispatch: # run manually
+    types: [check-link]
+  # push:
+  # ...
+
+name: Broken Link Check
+jobs:
+  check:
+    name: Broken Link Check
+    runs-on: ubuntu-latest
+    steps:
+      - name: Broken Link Check
+        uses: technote-space/broken-link-checker-action@v2

.github/workflows/issue-on-push.yml

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+on: [push]
+name: Create an issue on push
+permissions:
+  contents: read
+  issues: write 
+jobs:
+  stuff:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: JasonEtco/create-an-issue@v2
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}