feat(icons): expand brands icon pack and update all packs

Also, refactor icon resolution to avoid duplicated logic:

get_icon_svg.html	New shared core — alias resolution, pack lookup, hb fallback, user assets, hugo fallback. Returns raw SVG string.

get_icon.html	Thin wrapper — emoji handling, calls get_icon_svg, Unicode emoji fallback for bare names, attribute injection, safeHTML return.

get_icon_data.html	Thin wrapper — one-liner delegating to get_icon_svg.

modules/blox/assets/media/icons/brands/coursera.svg

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modules/blox/assets/media/icons/brands/datacamp.svg

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modules/blox/assets/media/icons/brands/edx.svg

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