first step at publishing the rpc endpoints

Author: kmurphypolygon

docs/zkEVM/api/json-rpc.md

@@ -3,4 +3,6 @@ hide:
 - toc
 ---
 
-<embed type="text/html" src="https://playground.open-rpc.org/?schemaUrl=https://raw.githubusercontent.com/0xPolygonHermez/zkevm-node/blob/develop/jsonrpc/endpoints_zkevm.openrpc.json?uiSchema[appBar][ui:input]=false&uiSchema[appBar][ui:splitView]=false" width="100%" height="1000px">
+<!--
+<embed type="text/html" src=<waiting-for-the-url>?uiSchema[appBar][ui:input]=false&uiSchema[appBar][ui:splitView]=false" width="100%" height="1000px">
+-->