[max-models]

Release 0.9.0. It was planned as 0.8.2 (#60); the figure look (#64) made it a minor release.

• PlotlyFigure on phones and touch screens (PlotlyFigure: compact figures on phones, scrolling on touch screens #60): taller frames, the legend in a row at the top, a fixed title as text above the figure, small margins, and room for an animation's controls. On touch screens there is no toolbar, and a drag scrolls the page. The figure config is now applied.
• Calmer figures in the site's colours (PlotlyFigure: calmer figures in the site's colours, caption and poster #64): axis lines only at the bottom and left, quiet tick labels, light grid lines, hover labels and legends in the page's colours. Black and white take the text and background colours, except for labels on colour maps, so figures converted from Matplotlib need no white plot area.
• New props (PlotlyFigure: calmer figures in the site's colours, caption and poster #64): caption, and poster/posterDark pictures shown until the figure loads and without JavaScript.
• Dark variants of Markdown images (Dark variants of Markdown images #63): x.dark.png next to x.png is shown in dark mode. Merge Dark variants of Markdown images #63 before this PR.
• Version 0.9.0 (the bump PR into devel).

On merge the release workflow tags v0.9.0, moves v0, and reruns the docs of the sites on v0.