fix: add download attribute to make Algolia ignore calendar invites

[Robbert]

Helaas werkt dit niet, nog even uitzoeken waarom niet :(

Getest met deze pagina: http://nldesignsystem.nl/events/developer-open-hour/aanmelden/bedankt

De console.log komt voorbij voor diverse linkjes, maar niet voor de ics linkjes.

Bedoeld om deze warning op te lossen:

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Project	Deployment	Preview	Comments	Updated (UTC)
documentatie	Ready	Preview	Comment	Sep 2, 2025 9:05am

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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