Jacek Łękawa

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

3

## 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...