Beta website part I

[deblasis]

This PR adds translations for the following pages:

• Installation (note: a lot of content here is similar to old website)
  • Start a New React Project
  • Editor Setup

in new BETA website

[github-actions]

Size Changes

📦 Next.js Bundle Analysis

This analysis was generated by the next.js bundle analysis action 🤖

Three Pages Changed Size

The following pages changed size from the code in this PR compared to its base branch:

Page	Size (compressed)	First Load
/learn/editor-setup	49.15 KB (🟡 +214 B)	133.81 KB
/learn/installation	48.38 KB (🟡 +122 B)	133.05 KB
/learn/start-a-new-react-project	49.51 KB (🟡 +226 B)	134.18 KB

Details

Only the gzipped size is provided here based on an expert tip.

First Load is the size of the global bundle plus the bundle for the individual page. If a user were to show up to your website and land on a given page, the first load size represents the amount of javascript that user would need to download. If next/link is used, subsequent page loads would only need to download that page's bundle (the number in the "Size" column), since the global bundle has already been downloaded.

Any third party scripts you have added directly to your app using the <script> tag are not accounted for in this analysis

Next to the size is how much the size has increased or decreased compared with the base branch of this PR. If this percentage has increased by 10% or more, there will be a red status indicator applied, indicating that special attention should be given to this.

[mattia-sanfilippo]

Ciao Alessandro, mi sono permesso di correggere un po' di typo 😃