merge jk/html-png-display + highdpi adjustments

new figure size and related theming adjustments

move html backend show out of cairomakie

move WEB_MIMES constant from WGLMakie into Makie

use strings again

fix test

smaller colorbar ticks

adjust more theming gaps

padding adjust

fix size of docs example

make toggle smaller

make colorbar thinner

smaller colorbar

adjust legend doc example

fix intervalslider and example

more docs fixes, axis legend padding

improve faq example

fix test value

CairoMakie/src/screen.jl

@@ -81,8 +81,8 @@ end
 to_cairo_antialias(aa::Int) = aa
 
 """
-* `px_per_unit = 2.0`: see [figure docs](https://docs.makie.org/stable/documentation/figure_size/).
-* `pt_per_unit = 0.75`: see [figure docs](https://docs.makie.org/stable/documentation/figure_size/).
+* `px_per_unit = 2.0`: see [figure docs](https://docs.makie.org/stable/documentation/figure/).
+* `pt_per_unit = 0.75`: see [figure docs](https://docs.makie.org/stable/documentation/figure/).
 * `antialias::Union{Symbol, Int} = :best`: antialias modus Cairo uses to draw. Applicable options: `[:best => Cairo.ANTIALIAS_BEST, :good => Cairo.ANTIALIAS_GOOD, :subpixel => Cairo.ANTIALIAS_SUBPIXEL, :none => Cairo.ANTIALIAS_NONE]`.
 * `visible::Bool`: if true, a browser/image viewer will open to display rendered output.
 """

src/display.jl

@@ -213,6 +213,9 @@ const WEB_MIMES = (
     MIME"application/prs.juno.plotpane+html",
     MIME"juliavscode/html")
 
+# because we have a default way to display pngs in html contexts, we can say that
+# if png is showable, so are the html types
+Base.showable(mime::Union{WEB_MIMES...}, fig::FigureLike) = showable(MIME"image/png"(), fig)
 
 backend_showable(@nospecialize(screen), @nospecialize(mime)) = false