Add automation to add link to RTD preview build to every PR

Co-authored-by: Rosio <[email protected]>

Author: mfisher87

.github/workflows/pr-rtd-link.yml

@@ -0,0 +1,27 @@
+# The ReadTheDocs preview link is "hidden" within the GitHub "Checks"
+# interface. For users who don't know this, finding the preview link may be
+# very difficult or frustrating. This workflow makes the link more
+# findable by updating PR descriptions to include it.
+name: 'Add ReadTheDocs preview link to PR description'
+
+on:
+  pull_request_target:
+    types:
+      - 'opened'
+
+permissions:
+  pull-requests: 'write'
+
+jobs:
+  autolink-rtd-previews:
+    runs-on: 'ubuntu-latest'
+    steps:
+      - uses: 'readthedocs/actions/preview@v1'
+        with:
+          project-slug: 'jupyter-community-committee'
+          single-version: true
+          single-language: true
+          message-template: |
+            ---
+            :mag: Preview: {docs-pr-index-url}
+            _Note: This Pull Request preview is provided by ReadTheDocs. Our production website, however, is currently deployed with GitHub Pages._