Add archival notice

README.md

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-![knossos banner](https://user-images.githubusercontent.com/12068027/100479893-d9b5a380-30ac-11eb-9db9-0c09d400f13f.png)
-
-## Modrinth's center for its frontend service
-
-For contributing information, please see the knossos section of the [Modrinth contributing guide](https://support.modrinth.com/en/articles/8802215-contributing-to-modrinth#h_1bc6570903).
-
-For a detailed explanation on how things work in general, check out the [Nuxt.js docs](https://nuxt.com).
+# Knossos is now known as `frontend` in Modrinth's monorepo here: https://github.com/modrinth/code/tree/main/apps/frontend
+This repo is archived and will no longer be updated.