Add meta images

[annavik]

Specify meta images using following logic:

• For project overview page, use project image
• For station details, use station cover image
• For session details, use first example capture
• For occurrence details, use first crop
• For species details, use first occurrence crop
• For other pages, use no image

Also, we introduce the library react-helmet-async as part of this PR, to make meta tags in general easier to handle.

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[mihow]

I just merged this, but realized I am not seeing an image for session detail pages. Can we make the session detail meta use the current capture? I don't know if exampleCaptures is available anymore? https://antenna.insectai.org/projects/20/sessions/2625?capture=4800881