Support latest Octicon icons

[MarcSkovMadsen]

Context

I am trying to do docs contributions to HoloViz Panel. I notice that something does not work when I use specific Octicon icons in the cards.

In holoviz/panel#6318 I request Panel to support these icons. But I'm told its really Sphinx-Design that do not support them. Sphinx-Design only supports the octicon-icons listed in https://sphinx-design.readthedocs.io/en/latest/badges_buttons.html#octicon-icons

Proposal

Support all Octicon Icons that can be found at https://primer.style/foundations/icons

Not Working

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[chrisjsewell]

This should be closed by #171, but feel free to re-open if not

[MarcSkovMadsen]

Thx