add apify account to requirements

Author: TC-MO

docs/01_overview/index.mdx

@@ -31,6 +31,7 @@ Key features:
 
 Before installing the Apify client, ensure your system meets the following requirements:
 
+- _An Apify account_
 - _Python 3.10 or higher_: You can download Python from the [official website](https://www.python.org/downloads/).
 - _Python package manager_: While this guide uses [pip](https://pip.pypa.io/en/stable/), you can also use any package manager you want.