[listing-request] Add [HACK-A-NOVA]

[ghost]

Please paste the following information into the following text to list your hackathon:

    {
      "title": "HACK-A-NOVA",
      "url": "https://hack-a-nova.web.app/",
      "startDate": "9 April 2021",
      "endDate": "11 April 2021",
      "year": "2021",
      "city": "Online",
      "host": "INNOVA DTU",
      "length": "60",
      "size": "unknown",
      "travel": "no",
      "prize": "yes",
      "highSchoolers": "yes",
      "cost": "free",
      "facebookURL": "https://www.facebook.com/innovadtu/photos/a.476048055765698/4115043725199428",
      "twitterURL": "https://twitter.com/yourhackathonname",
      "notes": ""
    }

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