add 'date' to Art tours

content/en/38c3/electrum/index.md

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-title: '37c3 Electrum - The Museum of Electricity'
+title: '38c3 Electrum - The Museum of Electricity'
+date: 2024-10-31T09:00:00+01:00
 summary: |
     The electrum is Hamburgs Museum of Electricity and Technology. Nothing works without electricity—for 130 years, electricity is part of our daily lives. You'll find around one thousands technical devices from all ages in electrum, Hamburgs museum of electricity in Harburgs inner harbour.
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content/en/38c3/energiebunker/index.md

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 title: '38c3 Energiebunker Wilhelmsburg'
+date: 2024-10-31T09:00:00+01:00
 summary: |
     A beacon of the energy transition: For far too long, the old anti-aircraft bunker in Wilhelmsburg was an architectural eyesore. Today, the former wartime building is a globally unique example of the innovative use of renewable energy and a pioneer for other regional power plants worldwide. During the tour through the building, you will learn more about the development of the Energiebunker (German for "energy bunker") from a wartime building to an innovative lighthouse project for the energy transition. Afterwards, you can enjoy the incomparable panoramic view over the city of Hamburg at Café vju.
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content/en/38c3/ndr/index.md

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 title: '38c3 NDR Fernsehen'
+date: 2024-10-31T09:00:00+01:00
 summary: |
     The guided tour of NDR television in Hamburg Lokstedt shows how television is made. 
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content/en/38c3/tour-der-giganten/index.md

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 title: '38c3 Tour of the giants'
+date: 2024-10-31T09:00:00+01:00
 summary: |
     Experience Germany's largest seaport from a completely new perspective. Port terminals around the world are security areas - and for the public it means: “No entry!” Not for us. As a cooperation partner of Hamburger Hafen und Logistik AG (HHLA), the Tour of the Giants exclusively shows you the Port of Hamburg behind the scenes.
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