Revert local build-only change to config.ini

Author: Haricharan0311

config.ini

@@ -29,7 +29,7 @@ resources = img/ d2l/ d2l.bib setup.py static/latex_style/
 exclusions = README.md STYLE_GUIDE.md INFO.md CODE_OF_CONDUCT.md CONTRIBUTING.md contrib/*md
 
 # If True (default), then will evaluate the notebook to obtain outputs.
-eval_notebook = False
+eval_notebook = True
 
 tabs = pytorch, mxnet, jax, tensorflow