near-sdk 5.5.0 and docs

[petersalomonsen]

• upgrade from near-sdk 4 to 5.5
• update README.md files to reflect the current state of the project
• add ft_transfer_internal to the JS environment in the FT contract, so that it is possible to transfer tokens without an attached deposit

[petersalomonsen]

@race-of-sloths include

[race-of-sloths]

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Great job! Usain Bolt jealous of your results!

Current status: executed

Reviewer	Score
@Tguntenaar	2

Your contribution is much appreciated with a final score of 2!
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[Tguntenaar]

@race-of-sloths score 2