max file sizes added to page 1

[axcooper]

Pull request overview

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Pull request checklist

Please check if your PR fulfills the following:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
• Tests have been run locally and are passing (shinytest2::test_app())
• Code is styled according to tidyverse styling (checked locally with styler::style_dir() and lintr::lint_dir())

What is the current behaviour?

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What is the new behaviour?

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Anything else

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[johalastrahol]

Does what is says on the tin - it informs what the max file size will be.