Remove benchmark which only exists on mainnet so far

Author: ArseniiPetrovich

networks/calibration/rpcs.md

@@ -12,8 +12,6 @@ Most of these endpoints are limited to the read-only [Filecoin JSON RPC API](../
 
 {% hint style="info" %} Please note that most publicly hosted endpoints <strong>only guarantee recent state, i.e. 2000 of the latest blocks (last 16.67 hours).</strong> To request an archival node you can contact a provider below. {% endhint %}
 
-In order to check the current benchmarked performance of each of the below endpoints, please see the [Filecoin ETH RPC Benchmark app](https://benchmark-rpc.vercel.app/).
-
 Provider | HTTPS endpoint | WSS endpoint | Docs | Filecoin API Support | ETH API Support | Archive 
 -- | -- | -- | -- | -- | -- | --
 [Glif Nodes](https://api.node.glif.io/) | `https://api.calibration.node.glif.io/rpc/v1` | `wss://wss.calibration.node.glif.io/apigw/lotus/rpc/v1` | [Glif Nodes - Docs](https://api.node.glif.io/) | Read-only methods + MPoolPush | All methods | Create a "Dedicated" key with "Archive" functionality