Added two DevOps resources beneficial for SRE interview prep

[bikashdaga]

For Site Reliability Engineering (SRE), it has become increasingly clear that a solid foundation in DevOps principles is essential. Recognizing this, I have contributed two resources that shed light on DevOps practices, underscoring their importance in the SRE landscape.

I hope that integrating these resources into the SRE Interview Preparation Guide will not only broaden the repository's scope but also enhance its utility for those preparing to step into the world of SRE.

Please let me know if any changes are needed.

Thank you.

[godwhoa]

Please disclose that you work on SEO for Scaler.

[bikashdaga]

Hey, @godwhoa!

I do work on SEO for Scaler while also learning programming.

My intention with this PR was to add suitable DevOps resources from the Scaler database.

I hope this answers your question.

Let me know if this is something you can merge.

Thanks!

Best, Bikash