Fix broken link to the installation guide (#912)

Updated the installation guide link to use the absolute URL instead of a relative path, ensuring it correctly points to 'https://docs.crewai.com/how-to/Installing-CrewAI/'.

docs/how-to/Start-a-New-CrewAI-Project.md

@@ -9,7 +9,7 @@ Welcome to the ultimate guide for starting a new CrewAI project. This document w
 
 ## Prerequisites
 
-We assume you have already installed CrewAI. If not, please refer to the [installation guide](how-to/Installing-CrewAI.md) to install CrewAI and its dependencies.
+We assume you have already installed CrewAI. If not, please refer to the [installation guide](https://docs.crewai.com/how-to/Installing-CrewAI/) to install CrewAI and its dependencies.
 
 ## Creating a New Project
 
@@ -134,4 +134,4 @@ This will initialize your crew of AI agents and begin task execution as defined
 
 ## Deploying Your Project
 
-The easiest way to deploy your crew is through [CrewAI+](https://www.crewai.com/crewaiplus), where you can deploy your crew in a few clicks.
+The easiest way to deploy your crew is through [CrewAI+](https://www.crewai.com/crewaiplus), where you can deploy your crew in a few clicks.