Remove unnecessary style attribyte on docs (aligning-images)

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Updated CDN URLs in v4-dev docs

Errata from:
* 8ce5da30
* 5d3144e8
which missed a few numbers.

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Remove !default Scss flag in docs grid example

Fix utility page code example Markdown

v4 alpha 2

/fyi @mdo There might be prettier/better ways of explaining these,
        but for the sake of having accurate docs for tomorrow,
        this should do in a pinch.

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Refactor _utilities-spacing.scss

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v4 - .c-select shouldn't inherit white text color

Add NuGet badge

Add NuGet support

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Refs #18110

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