translate start-a-new-project (#419)

* translate start-a-new-project

* Update src/content/learn/start-a-new-react-project.md

Co-authored-by: Mattia Sanfilippo <[email protected]>

* Update src/content/learn/start-a-new-react-project.md

Co-authored-by: Mattia Sanfilippo <[email protected]>

* Update src/content/learn/start-a-new-react-project.md

Co-authored-by: Mattia Sanfilippo <[email protected]>

* Update src/content/learn/start-a-new-react-project.md

Co-authored-by: Mattia Sanfilippo <[email protected]>

* Update src/content/learn/start-a-new-react-project.md

Co-authored-by: Mattia Sanfilippo <[email protected]>

* Update src/content/learn/start-a-new-react-project.md

Co-authored-by: Mattia Sanfilippo <[email protected]>

* fix: word consistency

* Update src/content/learn/start-a-new-react-project.md

Co-authored-by: Alessandro De Blasis <[email protected]>

* fix: installation index

* fix: sidebarLearn.json & installation.md

* chore(installation): rm \n

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Co-authored-by: Mattia Sanfilippo <[email protected]>
Co-authored-by: Alessandro De Blasis <[email protected]>

Author: 3 people

src/content/learn/installation.md

@@ -10,7 +10,7 @@ React è stato progettato sin dal principio per essere adottato gradualmente. A
 
 <YouWillLearn isChapter={true}>
 
-* [Come iniziare un nuovo progetto React](/learn/start-a-new-react-project)
+* [Come avviare un nuovo progetto React](/learn/start-a-new-react-project)
 * [Come aggiungere React ad un progetto esistente](/learn/add-react-to-an-existing-project)
 * [Come configurare il tuo editor](/learn/editor-setup)
 * [Come installare i React Developer Tools](/learn/react-developer-tools)