Fix the outdated llm document

[hydai]

Explanation

1. llama-utils is renamed to llamaedge
2. The links are all broken.

This PR fixed the above issues.

Related issue

Fixed WasmEdge/WasmEdge#3192

What type of PR is this

/kind documentation

Proposed Changes

Make things right.

[alabulei1]

Hello, I am a code review bot on flows.network. Here are my reviews of code commits in this PR.

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Commit 37aed9011aa62b626178a6da9e6968550ac5b452

Key changes in the patch:

• Updated the link to the example project in the introduction.
• Added a list of supported models with links to their details.
• Updated the link to the llama-chat.wasm file in the quick start section.
• Updated the link to the llama2 7b chat model in the curl command.
• Updated the link to the llamaedge repository in the build and run section.
• Updated the link to the huggingface model in the table.
• Updated the link to the main.rs file in the Understand the code section.

Potential problems:

• The links in the patch may not be accurate or up to date. It's important to verify that the links are correct and accessible.
• The changes may introduce new issues or break existing functionality. A thorough testing of the updated llm document is required.

[juntao]

Thanks!