black/white Activitypub icon added

images/platforms/black/activitypub.svg

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+<?xml version="1.0" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd" >
+<svg xmlns="http://www.w3.org/2000/svg" width="1em" height="1em" viewBox="0 0 24 24"><path fill="currentColor" d="M10.91 4.442L0 10.74v2.52l8.727-5.04v10.077l2.182 1.26zM6.545 12l-4.364 2.52l4.364 2.518zm6.545-2.52L17.455 12l-4.364 2.52zm0-5.038L24 10.74v2.52l-10.91 6.298v-2.52L21.819 12l-8.728-5.04z"/></svg>

images/platforms/black/activitypub.svg.license

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+SPDX-FileCopyrightText: Matthias Pfefferle https://github.com/pfefferle/openwebicons?ref=svgrepo.com
+SPDX-License-Identifier: CC0-1.0