iframe on front page of demo site needs to be resized so that there is no scrollbar

[pacharanero]

See https://growth.rcpch.ac.uk/

The demo site is embedded as an iframe, from a static React site which is CI'd in GitHub Pages and is live at https://rcpch.github.io/digital-growth-charts-react-client/

However the content of the demo client must have changed slightly and now it is displaying with a scroll bar, which is undesirable from an appearance point of view

• resize the iframe constraints to fit without needing a scroll bar
• (optional) see if there is a way to make it auto-adapt to future changes in demo client size

[Raxxius]

This issue will be resolved by completing issue:

Embed growth chart client into mkdocs, remove iframe #91

from rcpch/digital-growth-charts-react-client#91