docs: add troubleshooting for npx cache

[kanoru3101]

What/Why/How?

Sometimes the npx cache can cause an error for the npx <product> preview command. Updated documentation.

Reference

Closes #2290

Testing

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Check yourself

• Code changed? - Tested with Redoc/Realm/Reunite (internal)
• All new/updated code is covered by tests
• New package installed? - Tested in different environments (browser/node)
• Documentation update considered

Security

• The security impact of the change has been considered
• Code follows company security practices and guidelines

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Latest commit: 1274f1d

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[github-actions]

Command	Mean [s]	Min [s]	Max [s]	Relative
redocly lint resources/rebilly.yaml	1.326 ± 0.022	1.297	1.376	1.02 ± 0.02
redocly-next lint resources/rebilly.yaml	1.300 ± 0.019	1.263	1.330	1.00

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🟢	Lines	78.78% (🎯 78%)	5849 / 7424
🟢	Statements	78.21% (🎯 78%)	6044 / 7727
🟢	Functions	81.88% (🎯 81%)	1202 / 1468
🟢	Branches	71.05% (🎯 70%)	4050 / 5700

File Coverage

No changed files found.

Generated in workflow #7968 for commit 1274f1d by the Vitest Coverage Report Action