[rich-iannone]

This PR adds a <termshow-player> element, so Termshow recordings can play on pages not built with Quarto, such as MkDocs, Sphinx, Docusaurus or plain HTML. It reuses the existing player code: its attributes match the shortcode options, src takes a render directory or a manifest URL, and a manifest can also be embedded inside the element. It also has a small script API modeled on <video> (play(), pause(), seek(), currentTime, duration, paused) and fires ready, play, pause and ended events.

A new great-docs termshow assets DIR command copies the player's script, stylesheet and fonts and prints the HTML to load them. The shortcode keeps working as before, and the PR also fixes an error the player threw when its script loaded in the page's <head>.

[github-actions]

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