Duplicate anchor links break stuff!

[smartcontracts]

Describe the bug
We currently have situations where anchor links are duplicated. For example, the Research page has several "#research-questions" and "#resources" anchors:

https://www.learnplasma.org/en/research/#research-questions

This means that if you click on any "#research-questions" anchor on the page:

You'll automatically get sent to the first anchor:

Expected behavior
I think a good way to solve this for now is to have a script that detects duplicate anchor tags and adds -n to the end of the tag. That means we'll have "#research-questions-1" or "#research-questions-2" etc etc.

[iamonuwa]

@kfichter, I'll work on this immediately

[smartcontracts]

@iamonuwa awesome!