Add recommendation links to insights

Changes:

• Add a command to generate recommendation links from JSON file.
• Add URLContainer for links
• Add building of help links

Issue Ref: #61 (closed)

New response object schema

[
  {
    "ID": 18,
    "Time": "2020-11-02T10:44:34Z",
    "Rating": "bad",
    "Category": "local",
    "ContentType": "message_rbl",
    "Content": {
      "address": "",
      "recipient": "some.mail.com",
      "host": "Google",
      "delivery_status": "deferred",
      "message": "Sample Insight: host blocked. Try https://google.com/ to unblock it",
      "log_time": "2020-11-02T11:44:34.361444311+01:00"
    },
    "help_link": "https://kb.lightemter.io/KB0001"
  }
]