New functionality and docs for export to data reports

[dorisjlee]

Overview

Minor changes to enable integration with interactive data reports (Streamlit, DataPane)

Changes

• Added return HTML option to save_as_html
• reorganize and updated documentation for export
• added new documentation for export to DataPane and Streamlit
• Temporary pip install git+git://github.com/lux-org/lux-widget.git fix based on [BUG] Binder Jupyter Notebooks Error  #372

[codecov]

Codecov Report

Merging #378 (f40cef6) into master (2db6964) will decrease coverage by 0.05%.
The diff coverage is 60.86%.

@@            Coverage Diff             @@
##           master     #378      +/-   ##
==========================================
- Coverage   84.94%   84.89%   -0.06%     
==========================================
  Files          52       52              
  Lines        4019     4031      +12     
==========================================
+ Hits         3414     3422       +8     
- Misses        605      609       +4     

Impacted Files	Coverage Δ
lux/vis/Vis.py	75.73% <ø> (ø)
lux/core/frame.py	81.69% <16.66%> (-0.37%)	⬇️
lux/_config/config.py	84.93% <55.55%> (-1.93%)	⬇️
lux/vis/VisList.py	52.84% <100.00%> (ø)
lux/vislib/altair/AltairChart.py	91.52% <100.00%> (+0.29%)	⬆️
lux/vislib/altair/BarChart.py	86.48% <100.00%> (+0.37%)	⬆️
lux/vislib/altair/Choropleth.py	93.93% <100.00%> (-0.27%)	⬇️
lux/vislib/matplotlib/ScatterChart.py	76.47% <0.00%> (+1.17%)	⬆️
lux/vislib/altair/ScatterChart.py	96.96% <0.00%> (+3.03%)	⬆️

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