Docs: Add Info about file size in FileUploader #DS-993

[pavelklibani]

Description

The primary update is in the React README, which is now referenced by other packages.

• Added an example demonstrating how to calculate file size.
• Clarified the distinction between the base-10 and base-2 systems.
• Included examples for PHP and Next.js configurations, along with their shorthands.

Additional context

Issue reference

FileUploader: file size limit dokumentace

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[coveralls]

coverage: 79.469%. remained the same
when pulling 685a5d8 on docs/ds-993-fileuploader-file-size-limit
into 1676c2d on main.

[literat]

Nicely documented. I love it. Thanks :-)

[adamkudrna]

Astonishing and valuable. I learned something new today, thank you!