Update docs theme for rebranding (#238)

Author: scharlottej13

.github/workflows/ci-build.yaml

@@ -20,7 +20,7 @@ jobs:
         shell: bash -l {0}
         run: |
           conda install -c conda-forge nbconvert nbformat jupyter_client ipykernel
-          pip install nbsphinx dask-sphinx-theme sphinx
+          pip install nbsphinx dask-sphinx-theme>=3.0.0 sphinx
       - name: Build
         shell: bash -l {0}
         run: |

conf.py

@@ -83,7 +83,9 @@
 exclude_patterns = ['_build', 'Thumbs.db', '.DS_Store', '**.ipynb_checkpoints']
 
 # The name of the Pygments (syntax highlighting) style to use.
-pygments_style = 'sphinx'
+# Commenting this out for now, if we register dask pygments,
+# then eventually this line can be:
+# pygments_style = "dask"
 
 
 # -- Options for HTML output -------------------------------------------------