fix: improve command and option parsing in generate-docs script

[seanlanglands]

Description

This pull request fixes the generate-docs.js script. The output is then ingested into our documentation site.

The vip --help output wraps long option/command descriptions across multiple lines (commander.js wraps to the terminal width, which is 80 columns when stdout is piped in CI). Two bugs resulted:

1. Corrupted JSON output — every wrapped continuation line (e.g. for a (sub)command. (default: false)) failed the OPTION_REGEXP match and hit console.log('Unknown option', line). That's console.log, so it wrote to stdout — polluting the /tmp/docs.json file the publish-docs workflow redirects to. The JSON was invalid.
2. Lost description text — the wrapped continuation lines were dropped entirely instead of being appended to their option's description.

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None

[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

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

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