FIX: fix mybinder environment

Author: mmcky

.github/workflows/publish.yml

@@ -59,7 +59,6 @@ jobs:
         run: |
           mkdir -p _build/lecture-python.notebooks
           cp -a _notebook_repo/. _build/lecture-python.notebooks
-          cp environment.yml _build/lecture-python.notebooks
           cp _build/jupyter/*.ipynb _build/lecture-python.notebooks
           ls -a _build/lecture-python.notebooks
       - name: Commit latest notebooks to lecture-python.notebooks

_notebook_repo/environment.yml

@@ -0,0 +1,7 @@
+name: lecture-python
+channels:
+  - default
+dependencies:
+  - python=3.8
+  - anaconda
+