docs(all): remove replace global npm installation, re-write content

[JLekawa]

What/Why/How?

Replaces global installation with local installation.

Closes https://github.com/Redocly/redocly/issues/19220

Check yourself

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

Security

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

[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: e5faf4c473847cf0d28d78852f2ac02156a77773

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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[github-actions[bot]]

Command	Mean [s]	Min [s]	Max [s]	Relative
redocly lint resources/rebilly.yaml	1.497 ± 0.021	1.465	1.518	1.00 ± 0.02
redocly-next lint resources/rebilly.yaml	1.495 ± 0.022	1.463	1.529	1.00

[github-actions[bot]]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	78.58% (🎯 78%)	6185 / 7870
🔵	Statements	78.01% (🎯 78%)	6390 / 8191
🔵	Functions	81.97% (🎯 81%)	1264 / 1542
🔵	Branches	70.39% (🎯 70%)	4239 / 6022

File Coverage

No changed files found.

Generated in workflow #8207 for commit e5faf4c by the Vitest Coverage Report Action