Add Note and Doc Link for Manifest Download

[b-f-chan]

Add the note and documentation link in the File Manifest download button per original mockups:

The instructions link should go to https://overture.bio/documentation/score/user-guide/download

[b-f-chan]

@caravinci will cover as part of Arranger re-write after chatting with him, because he wants to do it properly with the refactor

[justincorrigible]

In this PR, I've added something similar to the design by @kcullion (as customising arranger to look fully like the mock, would imply a larger set of changes).
Note: using the link described in the ticket may need to be modified, as it currently leads to a 404.

[kcullion]

In this PR, I've added something similar to the design by @kcullion (as customising arranger to look fully like the mock, would imply a larger set of changes).
Note: using the link described in the ticket may need to be modified, as it currently leads to a 404.

sounds good to me.
yeah the link would probably go to this section (but @b-f-chan I don't see a section on that page for user to download data using a file manifest) https://www.overture.bio/documentation/dms/user-guide/data-portal/

[b-f-chan]

Confirming new/final link will be:
https://www.overture.bio/documentation/score/user-guide/download

Because using the manifest to download is actually a score client function, not DMS UI.

[justincorrigible]

Updating PR to include the URL.

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Edit: as it turns out, that was the link I had added in the PR. It's good for Review, then.