"search"-functionality loading is blocking front page loading

[andrewpollack]

Context: #4270

Today, the search functionality takes time to load, preventing readers from using the front page. Immediate fix is to disable the search functionality (see #4272), but longer term fixes could be:

• Fix described slowness behavior in Slow homepage response on iOS / iPadOS Safari #4270
• Convert search loading functionality a non-blocking call
• Move search functionality to its own page (thus unblocking front-page from search related slowness)