add @daviddarnes/heading-anchors

[rdela]

At least until #40 finds resolution, building on the work in #39, adding daviddarnes/heading-anchors per rec in 11ty/eleventy #3363

Used position="beforeend" and styled with a slight adjustment to demo-styling, adding vertical-align: bottom; to a[href^="#"] and constraining styles to heading-anchors element.

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[socket-security[bot]]

New dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
npm/@daviddarnes/heading-anchors@2.0.0	None	0	16.1 kB	daviddarnes

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[rdela]

Having heading-anchors on the base template makes it work on pages as well.

• add hover + focus styles
• delete deprecated css
• 9.2.21-alpha.17