Remove "url" key from ed_framework.node

[hbarrett]

Change:

"ed_frameworks": [
        {
          "name": "ESIP Data Management for Scientists Short Course", 
          "nodes": [
            {
              "description": "", 
              "name": "The Case for Data Stewardship", 
              "url": ""
            }
          ]
        }
      ]

To:

"ed_frameworks": [
        {
          "name": "ESIP Data Management for Scientists Short Course", 
          "nodes": [
            {
              "description": "", 
              "name": "The Case for Data Stewardship"
            }
          ]
        }
      ]