docs: render CairoMakie figures as SVG, like Plots

[ocots]

What

Phase K (#921) added the first Makie page — examples/logo.md — but its three figures render as raster PNG. DocumenterVitepress ranks image/png (4.0) above image/svg+xml (3.0), and CairoMakie — contrary to the note in Handbook/VITEPRESS-DOC.md ("CairoMakie … No action needed") — responds to both MIME types, so PNG wins.

Fixed the same way as Plots (#903): disable PNG capture globally in make.jl.

using Plots
import CairoMakie   # import, not using — see below
Base.showable(::MIME"image/png", ::Plots.Plot) = false
CairoMakie.activate!(; type="svg")
Base.showable(::MIME"image/png", ::CairoMakie.Makie.Figure) = false

Why import, not using: using CairoMakie pulls Makie's plot / plot! into Main, where they collide with Plots' — the @docs block on results/plot.md then fails with undefined binding 'plot!' and terminates the build. import keeps the extension-loading (so Makie.plot(sol) still works on the logo page) without the namespace pollution.

Verification

Full julia --project=. docs/make.jl: exit 0, 0 Cannot resolve @ref, no docs_block error. All 50 built figures are now .svg (the logo page's three included). Only remaining build errors are the 4 unchanged Phase-D @extref items.

Companion

Handbook/VITEPRESS-DOC.md's "Plot image format" bullet still says CairoMakie needs no action — corrected in Handbook#18.

Add the run documentation label to build the site in CI.

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