Add accordion to pipeline parameter headers

[silverslott]

Issue: https://github.com/nf-core/website/issues/1200

I have not gotten the href to the header to work, now sure why it isn't working 🤔

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[silverslott]

Ah, I know why it isn't working, it's in the SidebarToc.svelte file, line 62

[silverslott]

Ok, seems to work!

[mashehu]

@nf-core-bot fix linting