Typo in intro

There is a little typo in the intro text:

_If you have read Medium or Twitter in the last few months, you'll be forgiven for thinking that all web applications are built as single-page apps which manage **stare** on the client the client._

Find the intro text containing the quoted sentence and read the surrounding paragraph. Correct the reported typo and duplicated wording, then verify that the sentence reads cleanly in the rendered introduction.

Written by the indexing model from the issue text.