add support for quick links from the homepage & search page

Created by: slimsag

This adds support for a new quicklinks property you can set in user/org/global settings which allows adding some links to be quickly accessible from the homepage and search page.

(It is my intent to ship this quickly in a patch release as it is a blocking issue for a major user.)

How it looks:

Test plan: Manual & minor unit test & e2e tests / Percy

Helps https://app.hubspot.com/contacts/2762526/company/554338610