Update VSCode Extension and link and descriptions on Create Serverless Function form

Description of problem:

Update the VScode extension link to https://marketplace.visualstudio.com/items?itemName=redhat.vscode-openshift-connector

And change the description to 

The OpenShift Serverless Functions support in the VSCode IDE extension enables developers to effortlessly create, build, run, invoke and deploy serverless functions on OpenShift, providing a seamless development experience within the familiar VSCode environment.