[DOCS] Broken link: Broken external links in documentation (GitHub 404)

[Lambo-IITian]

Description

Some external links in the documentation currently point to GitHub pages that return 404 errors.

1. Install page

• Contains links to GitHub resources that no longer exist.
  https://wasmedge.org/docs/start/install
  Links to:
  https://github.com/WasmEdge/WasmEdge/actions/runs/2969775464#artifacts
  which returns 404

2. WASI proposals page

• Contains links to GitHub resources that no longer exist.
  https://wasmedge.org/docs/start/wasmedge/extensions/proposals
  Links to:
  https://github.com/WebAssembly/WASI/blob/main/Proposals.md
  which returns 404.

Expected Behavior

Links should point to valid and existing resources.

Suggested Fix

Update or replace outdated GitHub links with valid sources.

I am happy to work on fixing these if confirmed.

[Lambo-IITian]

Hi @hydai, I noticed this link is broken. Should it be removed, or redirected to another page?