title: JQ delete multiple properties
body: <p>I have an object like this:</p>
  
  <pre><code>{
      "a" : 1,
      "b" : {
          "c" : {
              "c1" : "abc",
              "source" : "abcxyz"
          },
          "d" : {
              "d1" : "abcd",
              "source" : "abcxyz"
          },
          "e" : {
              "e1" : "abcde",
              "source" : "abcxyz"
          }
      }
  }
  </code></pre>
  
  <p>My expectation is</p>
  
  <pre><code>{
      "a" : 1,
      "b" : {
          "c" : {
              "c1" : "abc"
          },
          "d" : {
              "d1" : "abcd"
          },
          "e" : {
              "e1" : "abcde"
          }
      }
  }
  </code></pre>
  
  <p>I want to remove "source" properties. How can I do that without specifying keys "c", "d" or "e", because they are dynamic.</p>