Add CI Job for Documentation Link Validation

[Abd-Standard]

Description

Add an automated check for broken internal documentation links.

Acceptance Criteria

The workflow is documented.

Markdown links are scanned.

Broken repository-relative links fail or warn according to project policy.

External links can be handled without making CI unnecessarily fragile.

[SHEROSE0]

@SHEROSE0 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi maintainer, I've read this description and I understood it kindly assign to me thank you

ℹ️ Repo Maintainers: To accept this application, review their application or assign @SHEROSE0 to this issue.

[Alimzy]

@Alimzy has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi! I'd like to work on this issue.

I'm a software engineer with hands-on experience in testing, debugging, and building reliable features across the stack. I'm confident I can take this on and deliver a solid, well-tested solution that follows the project's existing conventions.

I'll make sure to cover the core functionality as well as relevant edge cases to keep things reliable and regression-resistant.

Let me know if I can get started, and I'll provide updates as I progress.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Alimzy to this issue.