67 update speaker links

[lukeshafer]

Resolves #67

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[ghostdevv]

Amazing! Only two things:

• Cards in /streams aren't updating
• Could you possibly add a link to their twitter on the persons page so that isn't lost

[lukeshafer]

Will do!

[lukeshafer]

I added type casting in the speakers route +page.server.ts file so using the speaker properties would be easier. Please let me know if that needs changing!