github/orcid/mastodon/bluesky/matrix: official Simple Icons paths
(CC0), fetched from simple-icons/simple-icons. linkedin: Simple Icons
no longer includes it (removed from the project entirely, likely a
brand/legal request), so sourced from Tabler Icons' brand-linkedin
(filled variant, MIT license) instead for a closer visual match to
the other filled-style icons than their outline variant.
Previous icons were reconstructed from memory as an approximation,
not verified against any actual licensed source.
haemka
3f8b62489c