build(site): [SITE-07] preserve historical Codicons attribution

docs/licenses/monaco-editor/codicons/ATTRIBUTION.md

@@ -0,0 +1,17 @@
+# Codicons font attribution
+
+The unmodified Codicons font by Microsoft and contributors is included at
+`/assets/js/vs/base/browser/ui/codicons/codicon/codicon.ttf`.
+Its bytes match `@vscode/codicons@0.0.26`, published November 4, 2021.
+
+- [Original package archive](https://registry.npmjs.org/@vscode/codicons/-/codicons-0.0.26.tgz)
+- [Source revision](https://github.com/microsoft/vscode-codicons/tree/e4d1223d4145fe465db4930aae646ec0e45a4a87)
+- [Original README and legal notices](README.md)
+- Documentation and other content: [CC BY 4.0](LICENSE)
+- Code: [MIT](LICENSE-CODE)
+
+The license split above is stated in this historical package's README. The font
+is distributed unchanged; this attribution file was added by the ArtPlayer project.
+The three upstream files alongside it are preserved byte for byte, including line endings.
+
+Font SHA-256: `ff6b888d65cfd8077d49c6c704c1bfc8f2ce1ed71db9c583c63e0a49f046c79c`.