docs: fix AEP source reference links

[tharune]

Summary

• Update AEP-56 certificate validation source reference to the current Console path
• Update AEP-56 SDL source reference to the current AkashJS path

Verification

• Confirmed the old Console CertificateValidator.ts URL returns HTTP 404
• Confirmed the new Console CertificateValidator/CertificateValidator.ts URL returns HTTP 200
• Confirmed the old AkashJS src/sdl/SDL/SDL.ts URL returns HTTP 404
• Confirmed the new AkashJS src/sdl/index.ts URL returns HTTP 200
• Ran git diff --check