Moved RTD to own action.

.github/workflows/main.yml

@@ -155,19 +155,6 @@ jobs:
           cd demo
           for file in *.ipynb; do papermill $file foo.ipynb; done
         name: Test all demo notebooks 
-  
-  RTD-links:
-    on:
-      pull_request_target:
-        types:
-          -opened
-    permissions:
-      pull-requests: write
-    runs-on: ubuntu-latest
-    steps:
-      - uses: readthedocs/actions/preview@v1
-        with:
-          project-slug: "montepy"
 
   format-test:
     runs-on: ubuntu-latest

.github/workflows/rtd_link.yml

@@ -0,0 +1,17 @@
+name: add RTD links
+on:
+  pull_request_target:
+    types:
+      - opened
+    # Execute this action only on PRs that touch
+    # documentation files.
+    # paths:
+    #   - "docs/**"
+
+  permissions:
+    pull-requests: write
+  runs-on: ubuntu-latest
+  steps:
+    - uses: readthedocs/actions/preview@v1
+      with:
+        project-slug: "montepy"