update connector READMEs (#420)

Co-authored-by: py <pranshi.hasura.io>

registry/hasura/bigquery/README.md

@@ -43,6 +43,7 @@ Below, you'll find a matrix of all supported features for the BigQuery connector
 | Naming Conventions              | ❌        |       |
 | Default Values                  | ❌        |       |
 | User-defined Functions          | ❌        |       |
+| Variables                       | ❌        |       |
 
 ## Prerequisites
 
@@ -54,7 +55,7 @@ Below, you'll find a matrix of all supported features for the BigQuery connector
 
 The steps below explain how to initialize and configure a connector on your local machine (typically for development
 purposes).You can learn how to deploy a connector to Hasura DDN — after it's been configured —
-[here](https://hasura.io/docs/3.0/getting-started/deployment/deploy-a-connector).
+[here](https://hasura.io/docs/3.0/deployment/ddn/deploy-a-connector).
 
 ## Using the BigQuery connector
 

registry/hasura/sqlserver/README.md

@@ -50,12 +50,11 @@ Below, you'll find a matrix of all supported features for the SQL Server connect
 1. Create a [Hasura Cloud account](https://console.hasura.io)
 2. Please ensure you have the [DDN CLI](https://hasura.io/docs/3.0/cli/installation) and
    [Docker](https://docs.docker.com/engine/install/) installed
-3. [Create a supergraph](https://hasura.io/docs/3.0/getting-started/init-supergraph)
-4. [Create a subgraph](https://hasura.io/docs/3.0/getting-started/init-subgraph)
+3. [Create a supergraph](https://hasura.io/docs/3.0/cli/commands/ddn_supergraph_init)
 
 The steps below explain how to initialize and configure a connector on your local machine (typically for development
 purposes).You can learn how to deploy a connector to Hasura DDN — after it's been configured —
-[here](https://hasura.io/docs/3.0/getting-started/deployment/deploy-a-connector).
+[here](https://hasura.io/docs/3.0/deployment/ddn/deploy-a-connector).
 
 ## Using the SQLServer connector