docs: re-add nbsphinx to requirements-dev.txt

requirements-dev.txt

@@ -1,30 +1,46 @@
+alabaster==0.7.12
 appnope==0.1.0
 attrs==19.3.0
+Babel==2.8.0
 backcall==0.1.0
+bleach==3.1.5
+certifi==2020.6.20
+chardet==3.0.4
 coverage==5.0.3
 cycler==0.10.0
 decorator==4.4.2
+defusedxml==0.6.0
 descartes==1.1.0
+docutils==0.16
+entrypoints==0.3
 hypothesis==5.6.0
+idna==2.10
+imagesize==1.2.0
 importlib-metadata==1.5.0
 ipykernel==5.1.4
 ipython==7.13.0
 ipython-genutils==0.2.0
 jedi==0.16.0
+Jinja2==2.11.2
 jsonschema==3.2.0
 jupyter-client==6.0.0
 jupyter-core==4.6.3
 jupytext==1.5.2
 kiwisolver==1.2.0
+MarkupSafe==1.1.1
 matplotlib==3.3.0
+mistune==0.8.4
 mizani==0.7.1
 more-itertools==8.2.0
+nbconvert==5.6.1
 nbformat==5.0.4
+nbsphinx==0.7.1
 nbval==0.9.5
 numpy==1.19.1
 packaging==20.3
 palettable==3.3.0
 pandas==1.1.0
+pandocfilters==1.4.2
 parso==0.6.2
 patsy==0.5.1
 pexpect==4.8.0
@@ -44,13 +60,25 @@ python-dateutil==2.8.1
 pytz==2020.1
 PyYAML==5.3.1
 pyzmq==19.0.0
+requests==2.24.0
 scipy==1.5.2
 six==1.14.0
+snowballstemmer==2.0.0
 sortedcontainers==2.1.0
+Sphinx==3.1.2
+sphinxcontrib-applehelp==1.0.2
+sphinxcontrib-devhelp==1.0.2
+sphinxcontrib-htmlhelp==1.0.3
+sphinxcontrib-jsmath==1.0.1
+sphinxcontrib-qthelp==1.0.3
+sphinxcontrib-serializinghtml==1.1.4
 SQLAlchemy==1.3.18
 statsmodels==0.11.1
+testpath==0.4.4
 toml==0.10.1
 tornado==6.0.4
 traitlets==4.3.3
+urllib3==1.25.10
 wcwidth==0.1.8
+webencodings==0.5.1
 zipp==3.1.0