address small issues with new Home page

[Simek]

How

Address small issues with new Home page:

• invalid props used in FloorBackground component
• set minimal height to the social links container to avoid layout shift on load
• extend the SectionTile max width slightly to better align the sentences

CC @jonsamp

Preview

https://github.com/facebook/react-native-website/assets/719641/a27fba96-e931-446c-8fc4-9a443e90d0ab

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