fix for mcp link to openctx (#217)

Author: chris-sev

provider/modelcontextprotocol/README.md

@@ -12,7 +12,7 @@ Currently, only MCP over stdio is supported (HTTP is not yet supported).
     ```json
     "openctx.providers": {
         // ...other providers...
-        "https://openctx.org/npm/@openctx/modelcontextprotocol": {
+        "https://openctx.org/npm/@openctx/provider-modelcontextprotocol": {
             "nodeCommand": "node",
             "mcp.provider.uri": "file:///path/to/servers/root/build/everything/index.js",
         }
@@ -25,7 +25,7 @@ To hook up to the Postgres MCP provider, use:
 ```json
 "openctx.providers": {
     // ...other providers...
-    "https://openctx.org/npm/@openctx/modelcontextprotocol": {
+    "https://openctx.org/npm/@openctx/provider-modelcontextprotocol": {
         "nodeCommand": "node",
         "mcp.provider.uri": "file:///path/to/servers/root/build/postgres/index.js",
         "mcp.provider.args": [