meta: FAIR signposting level 1 support (link rel item)

[ptamarit]

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Description

• Partially fixes FAIR signposting level 1 support (HTTP Link headers & link rel item) #2937
• See description in linked ticket

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[ptamarit]

It seems that we do not use the alternate type in the right way. According to MDN's documentation, it's meant to "indicates that the referenced document is an alternative format (such as a PDF)", but in our case files are other documents than the landing page.

We could remove this line, but on the other hand, people might be relying on it already.