docs : Add vLLM Usage : starting-with-vllm

[hhhhhhhhhhhhhhhhho]

Pull Request Description

Target branch: dev ✅

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Description

• Added instructions for **starting with vllm **
• Provides guidance on installing and configuring vLLM, enabling users to easily integrate LLM/RAG functionality.
• No changes to existing features or UI; this is purely a documentation update.

Added

• Add vLLM Usage in quick-start:
  • vllm server setting
  • connection in openwebui

Deprecated

• None

Removed

• None

Fixed

• None

Security

• None

Breaking Changes

• None

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Additional Information

• This is a documentation-only update; no impact on existing functionality.
• No related issues or prior discussions.

Screenshots or Videos

• Not applicable (documentation update only)

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[pr-validator-bot]

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[Classic298]

@hhhhhhhhhhhhhhhhho thanks!

QQ: why did you change the order of the menu points?
also this should be merged to main instead and not dev

[hhhhhhhhhhhhhhhhho]

Oh! i re open this pr to main branch

and i think it gonna be good place next to ollama , openai, llama.cpp ..