Fix example server install instructions

[jasonacox]

This pull request fixes the server example's dependencies and installation instructions.

# from
pip install .
pip install -f requirements.txt

# to this
pip install diffusers
pip install -r requirements.txt

Dependency Updates:

• Updated huggingface-hub to version 0.35.0 in requirements.txt to ensure compatibility with recent features and bug fixes.
• Added accelerate to requirements.in to support efficient model inference and hardware utilization.
• Note: This follows the server-async instructions.

Installation Instructions:

• Updated the installation commands in README.md to explicitly install diffusers and corrected the requirements file flag to -r for clarity and correctness.

• Docs: @stevhliu and @sayakpaul

[Copilot]

Pull Request Overview

This PR fixes the server example's installation instructions and updates dependencies to ensure proper setup and compatibility. The changes correct installation commands and update package versions to match current requirements.

• Updated installation instructions to properly install diffusers and use correct pip flags
• Updated huggingface-hub to version 0.35.0 for compatibility
• Added accelerate dependency to support efficient model inference

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
examples/server/requirements.txt	Updates huggingface-hub version to 0.35.0
examples/server/requirements.in	Adds accelerate dependency for model inference
examples/server/README.md	Fixes installation commands to use correct pip syntax

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[HuggingFaceDocBuilderDev]

The docs for this PR live here. All of your documentation changes will be reflected on that endpoint. The docs are available until 30 days after the last update.

[sayakpaul]

Thank you!