Two-column layout for data/visualisations

[Roly Perera]

With #980 there is a fair amount of “flicker” as the data view grows and shrinks. It might be less intrusive to have the data shown in a separate column to the left of the main column containing the visualisation and narrative text.

• Make left column larger
• Move headings to right column (reserve left for data)
• Put inputs in left column
  • New div with id <figName>-input in left column
• Grow left column to left as size changes
  • Drop simplegrid.css – predates CSS grids which are simpler and more powerful
• Put input elements on same grid row as associated outputs?
• Vertically align LineChart and BarChart on bottom edge

See also:

• #959
• #981
• #858