Broken LICENSE links in multiple README files

[Noisyxl]

Description:
There are incorrect links to the LICENCE file across several README.md files in this repository. The links currently point to ./LICENSE but the file is actually named ./LICENCE.

Fix:
Update all README.md files to consistently point to the correct file:

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• [MIT]. (./LICENSE)

• [MIT]. (./LICENCE)
  Files affected:

create-nil-hardhat-project/README.md

docs/README.md

smart-contracts/README.md

This fix has already been tested in this PR but was closed per request to move it to an issue.

Let me know if you'd like me to submit a new PR again!

Thanks 🙂