Investigate the implementation of the docs Search functionality

[dmihaylo]

Investigate the implementation of the Search functionality in the docs sections (KB specifically) as it demonstrates some peculiarities.

For example, in the KB section:
On some occasions, hitting Enter leads to nothing and doesn’t trigger a new search. The search-result preview changes when you go to the second page and doesn't show a date anymore. On one occasion, there was an article that I was able to find on Google but not in the jQuery KB section.

cc @yordan-mitev