docs(pt-br): translate installation page

[pedrowindisch]

issue: #555

vi que várias partes desta página estão parecidas com a documentação atual do react (conforme o issue reactjs/reactjs.org#4135 especifica), então "roubei" algumas frases de lá

[pedrowindisch]

não traduzi o termo sandbox, achei que fica mais adequado do que editor de código (termo sendo usado na docs atual). o que acham?

[github-actions]

Size Changes

📦 Next.js Bundle Analysis

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

One Page Changed Size

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

Page	Size (compressed)	First Load
/learn/installation	208.47 KB (🟡 +156 B)	299.25 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.

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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.