Docs: React docs: Remember last used framework in the browser and redirect to it upon the next visit

[warpech]

Description

User story:

As a React developer I want to be able to easily reach the React-specific docs and each time I re-visit it see the proper version of it, so I don’t waste my time wandering around site looking for a switcher.

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We have explained this in the design document in the following way:

The last used FIXED_PHRASE is remembered in the browser (as a cookie or localStorage). The next time the user visits https://handsontable.com/docs/, they should be redirected to https://handsontable.com/docs/FIXED_PHRASE/

The "fixed phrase" is either "javascript-data-grid" or "react-data-grid"

Links

https://handsontable.com/docs/