fix: correct go install module path in README

[pcfreak30]

This pull request fixes the Go module path in the README's installation instructions. The go install command has been updated to use the correct module path (go.lumeweb.com/pinner-cli) instead of the GitHub repository path (github.com/lumeweb/pinner-cli), ensuring users can successfully install the CLI tool using the documented command.

[kody-ai]

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[github-actions]

Code Coverage Report

Total Coverage: 53.5%

Generated from commit: eaf19cc
Repository: LumeWeb/pinner-cli