RFR: Added QuickLink boxes

[Iris Clark]

On Thu, 29 Oct 2020 23:11:33 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

> The intention with the QuickLink boxes is that experienced developers who only want to find the right technical page should be able to do so without having to browse the text.

Marked as reviewed by iris (Reviewer).

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PR: https://git.openjdk.java.net/guide/pull/34