chore(assets): move logo artwork files to Topola's main repository

I, Michał Stankiewicz, hereby license the committed files, which contain
Topola's logo in multiple variants, under two licences at the same time:

- Creative Commons Attribution 4.0 International (SPDX: CC-BY-4.0)
- MIT (SPDX: MIT)

Signed-off-by: Michał Stankiewicz <kontakt@stankiewiczm.eu>

assets/logos/icon.svg

@@ -0,0 +1 @@
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assets/logos/inverted_icon.svg

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?><!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd"><svg width="100%" height="100%" viewBox="0 0 1389 1389" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xml:space="preserve" xmlns:serif="http://www.serif.com/" style="fill-rule:evenodd;clip-rule:evenodd;stroke-linejoin:round;stroke-miterlimit:2;"><rect id="Sygnet---light" serif:id="Sygnet - light" x="0" y="0" width="1388.89" height="1388.89" style="fill:#ff3434;"/><g><path d="M173.8,1111.51l191.811,-594.379c46.121,-142.919 178.932,-239.751 328.833,-239.751c149.902,0 282.713,96.832 328.834,239.751l191.811,594.379l-124.318,0l-180.042,-557.911c-30.336,-94.002 -117.689,-157.692 -216.285,-157.692c-98.595,0 -185.949,63.69 -216.284,157.692l-180.042,557.911l-124.318,0Z" style="fill:#fff;"/><path d="M377.45,1111.51l166.805,-516.891c21.065,-65.276 81.724,-109.502 150.189,-109.502c68.466,0 129.125,44.226 150.19,109.502l166.804,516.891l-124.317,0l-155.036,-480.423c-5.28,-16.359 -20.482,-27.443 -37.641,-27.443c-17.158,0 -32.36,11.084 -37.64,27.443l-155.036,480.423l-124.318,0Z" style="fill:#fff;"/></g></svg>