Rtd warning fix

.github/workflows/ci.yaml

@@ -79,6 +79,6 @@ jobs:
       #        test docs build only on PR
       #----------------------------------------------
       - name: Test docs build
-        uses: ammaraskar/sphinx-action@master
-        with:
-          docs-folder: "docs/"
+        run: |
+          cd docs
+          poetry run make html SPHINXOPTS="-W"

.readthedocs.yaml

@@ -18,4 +18,7 @@ formats:
 python:
   version: 3.7
   install:
-    - requirements: docs/requirements.txt
+    - method: pip
+      path: .
+      extra_requirements:
+        - docs

docs/requirements.txt

@@ -1,4 +1,5 @@
 # sphinx <4 required by myst-nb v0.12.0 (Feb 2021)
 # We might want to use myst-nb for doc tutorials with jupyter notebooks!
 sphinx >=3, <4
-sphinx-rtd-theme==0.5.2
+sphinx-rtd-theme==0.5.2
+.