npm: Improve the single detail view

[pjhampton]

Problem

In #3257 we added the single detail view back to improve engagement. But we need to make some changes to improve the UX.

Solution

1. Add the description from the api call
2. Remove the separator beside the More at link
3. Send a PR

People to notify

@duckduckgo/duckduckhack-contributors

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Instant Answer Page: https://duck.co/ia/view/npm