Documentation example scripts

Helper scripts for generating pydeck documentation.

• embed_examples.py creates a series of .rst files with both embedded source code and an embedded example in them.
• generate_grid_html.py creates an HTML grid of links to those rst pages within thumbnails. It is the landing page for pydeck's website.
• snap_thumbnails.py creates the .png files used as those thumbnails from examples.

Adding a new layer to the gallery

To add a new layer to the gallery:

0. Run pip install pyppeteer && pip install Image
1. Add the layer into the docs/images.rst
2. Run make html-grid-page
3. Create a thumbnail, e.g., python scripts/snap_thumbnails.py ../examples/arc_layer.py. If you have to create a thumbnail for multiple example files, run make html-thumbnails