chore(config): co-locate socket-repo-template-schema.json with marker

Mirrors socket-repo-template@4813c32 — moves
socket-repo-template-schema.json -> .config/socket-repo-template-schema.json
so it sits next to .config/socket-repo-template.json. The marker's
$schema ref simplifies from `../socket-repo-template-schema.json`
to `./socket-repo-template-schema.json`.

Author: jdalton

socket-repo-template-schema.json .config/socket-repo-template-schema.jsonsocket-repo-template-schema.json renamed to .config/socket-repo-template-schema.json

@@ -1,5 +1,5 @@
 {
-  "$schema": "../socket-repo-template-schema.json",
+  "$schema": "./socket-repo-template-schema.json",
   "schemaVersion": 1,
   "repoName": "socket-lib",
   "kind": "single-package",