[max-models]

Release 0.8.1: PlotlyFigure fixes.

• In the dev server of a site that installs the theme, plotly.js is served unbundled. The component now uses window.Plotly instead of failing with "Plotly.newPlot is not a function" (PlotlyFigure: plotly.js unbundled in dev, plot inside the frame #56).
• The plot is drawn into an inner box, so a figure with a fixed aspect ratio stays inside its frame (PlotlyFigure: plotly.js unbundled in dev, plot inside the frame #56).
• Buttons and sliders of animations take the site's colours and follow the theme toggle. Button menus no longer show Plotly's fixed light blue on the active button (PlotlyFigure: buttons and sliders in the site's colours #57).
• Version 0.8.1 (Bump version to 0.8.1 #58).

On merge the release workflow tags v0.8.1, moves v0, and reruns the docs of the sites on v0.