[docs] many improvements to the documentation / cleanup (#4817)

* fixed RSTs so images will show up on github
* fresh screenshots on main page
* removing irrelevant portions
* moved a set of sections under 'Misc'
* rebuilt the Gallery with all screenshots

docs/gallery.rst

@@ -1,89 +1,190 @@
-Gallery
-=======
+Visualizations Gallery
+======================
 
-.. image:: _static/img/viz_thumbnails/line.png
-   :scale: 50 %
+.. image:: images/viz_thumbnails/area.png
+   :scale: 25 %
 
-.. image:: _static/img/viz_thumbnails/bubble.png
-   :scale: 50 %
 
-.. image:: _static/img/viz_thumbnails/table.png
-   :scale: 50 %
+.. image:: images/viz_thumbnails/bar.png
+   :scale: 25 %
 
-.. image:: _static/img/viz_thumbnails/pie.png
-   :scale: 50 %
 
-.. image:: _static/img/viz_thumbnails/bar.png
-   :scale: 50 %
+.. image:: images/viz_thumbnails/big_number.png
+   :scale: 25 %
 
-.. image:: _static/img/viz_thumbnails/world_map.png
-   :scale: 50 %
 
-.. image:: _static/img/viz_thumbnails/sankey.png
-   :scale: 50 %
+.. image:: images/viz_thumbnails/big_number_total.png
+   :scale: 25 %
 
-.. image:: _static/img/viz_thumbnails/word_cloud.png
-   :scale: 50 %
 
-.. image:: _static/img/viz_thumbnails/filter_box.png
-   :scale: 50 %
+.. image:: images/viz_thumbnails/box_plot.png
+   :scale: 25 %
 
-.. image:: _static/img/viz_thumbnails/pivot_table.png
-   :scale: 50 %
 
-.. image:: _static/img/viz_thumbnails/directed_force.png
-   :scale: 50 %
+.. image:: images/viz_thumbnails/bubble.png
+   :scale: 25 %
 
-.. image:: _static/img/viz_thumbnails/compare.png
-   :scale: 50 %
 
-.. image:: _static/img/viz_thumbnails/sunburst.png
-   :scale: 50 %
+.. image:: images/viz_thumbnails/bullet.png
+   :scale: 25 %
 
-.. image:: _static/img/viz_thumbnails/area.png
-   :scale: 50 %
 
-.. image:: _static/img/viz_thumbnails/big_number.png
-   :scale: 50 %
+.. image:: images/viz_thumbnails/cal_heatmap.png
+   :scale: 25 %
 
-.. image:: _static/img/viz_thumbnails/big_number_total.png
-   :scale: 50 %
 
-.. image:: _static/img/viz_thumbnails/bullet.png
-   :scale: 50 %
+.. image:: images/viz_thumbnails/chord.png
+   :scale: 25 %
 
-.. image:: _static/img/viz_thumbnails/dist_bar.png
-   :scale: 50 %
 
-.. image:: _static/img/viz_thumbnails/heatmap.png
-   :scale: 50 %
+.. image:: images/viz_thumbnails/compare.png
+   :scale: 25 %
 
-.. image:: _static/img/viz_thumbnails/markup.png
-   :scale: 50 %
 
-.. image:: _static/img/viz_thumbnails/para.png
-   :scale: 50 %
+.. image:: images/viz_thumbnails/country_map.png
+   :scale: 25 %
 
-.. image:: _static/img/viz_thumbnails/iframe.png
-   :scale: 50 %
 
-.. image:: _static/img/viz_thumbnails/box_plot.png
-   :scale: 50 %
+.. image:: images/viz_thumbnails/deck_arc.png
+   :scale: 25 %
 
-.. image:: _static/img/viz_thumbnails/treemap.png
-   :scale: 50 %
 
-.. image:: _static/img/viz_thumbnails/cal_heatmap.png
-   :scale: 50 %
+.. image:: images/viz_thumbnails/deck_geojson.png
+   :scale: 25 %
 
-.. image:: _static/img/viz_thumbnails/horizon.png
-   :scale: 50 %
 
-.. image:: _static/img/viz_thumbnails/mapbox.png
-   :scale: 50 %
+.. image:: images/viz_thumbnails/deck_grid.png
+   :scale: 25 %
 
-.. image:: _static/img/viz_thumbnails/separator.png
-   :scale: 50 %
 
-.. image:: _static/img/viz_thumbnails/histogram.png
-   :scale: 50 %
+.. image:: images/viz_thumbnails/deck_hex.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/deck_multi.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/deck_path.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/deck_polygon.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/deck_scatter.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/deck_screengrid.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/directed_force.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/dist_bar.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/dual_line.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/event_flow.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/filter_box.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/heatmap.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/histogram.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/horizon.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/iframe.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/line.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/mapbox.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/markup.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/paired_ttest.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/para.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/partition.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/pie.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/pivot_table.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/rose.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/sankey.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/separator.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/sunburst.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/table.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/time_pivot.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/time_table.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/treemap.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/word_cloud.png
+   :scale: 25 %
+
+
+.. image:: images/viz_thumbnails/world_map.png
+   :scale: 25 %
+