Fix insecure URL scan and standardize APIs

[soumeh01]

Fixes:

• https://github.com/Arm-Debug/mcu-example-dashboard/issues/50

Changes

• Fix link checker flag from checkFilesHttp to checkHttp, so HTTP scan actually runs
• check-link.ts cleaned by standardizing APIs by using one promisified pattern for both file and process APIs
• Include a link-checking job in the nightly run so we are alerted if any links change or become unreachable.
• Updated a non-reachable URL in README

Checklist

• 🤖 This change is covered by unit tests (if applicable).
• 🤹 Manual testing has been performed (if necessary).
• 🛡️ Security impacts have been considered (if relevant).
• 📖 Documentation updates are complete (if required).
• 🧠 Third-party dependencies and TPIP updated (if required).

[qltysh]

Coverage Impact

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[jreineckearm]

Thanks, was briefly questioning why to run them in nightly builds. But then I saw the two README updates where presumably URLs have changed in the docs.