docs: Fix broken link in nx-flutter README.md

[BrutalCoding]

The path navigated to a non existing page because it led to 'packages/packages/...etc'. See screenshot.

PS. I just noticed that your commit style is in all lowercase - apologies for breaking the trend with a capital letter :p

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[nx-cloud[bot]]

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