Move files in preparation for monorepo migration

apps/knossos/COPYING.md

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+# Copying
+
+The source code of the knossos repository is licensed under the GNU Affero General Public License, Version 3 only, which is provided in the file [LICENSE](./LICENSE). However, some files listed below are licensed under a different license.
+
+## Modrinth logo
+
+Any files depicting the Modrinth branding, including the wrench-in-labyrinth logo, the landing image, and variations thereof, are licensed as follows:
+
+> All rights reserved. © 2020-2024 Rinth, Inc.
+
+This includes, but may not be limited to, the following files:
+
+- assets/images/404.svg
+- assets/images/logo.svg
+- components/brand/*
+- static/favicon.ico
+- static/favicon-light.ico
+
+## External logos
+
+The following files are owned by their respective copyright holders and must be used within each of their Brand Guidelines:
+
+- assets/images/external/*