The maintainers.json file has been deprecated and no longer has any use. (#10)

This commit removes this `maintainers.json` file.

config/maintainers.json

@@ -1,15 +0,0 @@
-{
-  "docs_url": "https://github.com/exercism/docs/blob/main/maintaining-a-track/maintainer-configuration.md",
-  "maintainers": [
-    {
-      "github_username": "larshp",
-      "alumnus": false,
-      "show_on_website": true,
-      "name": "Lars Hvam Petersen",
-      "link_text": null,
-      "link_url": "https://github.com/larshp",
-      "avatar_url": null,
-      "bio": null
-    }
-  ]
-}