Docs: update block codes at "Let's form the routes" section

[corocoto]

Background

Update block codes at "Let's form the routes" section, which allows us to see and use actual version and state of react-router-dom library.

Remark:

Starting from v6 version, react-router-dom marked Switch and Redirect (that placed inside of Switch) as deprecated components. As a recomendation Switch should be replaced by Routes, and Redirect by Navigate.

Related links from react-router-dom documentation:

• Upgrade all <Switch> elements to <Routes>
• Advantages of <Route element>
• Remove <Redirect>s inside <Switch>

[netlify[bot]]

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[azinit]

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