Add content to Cybersecurity roadmap (#6271)

* Update dns.md - Fix the YouTube video link error and update the video title.

* Update understand-cia-triad.md

* Update comptia-security.md

- Fix all broken links.
- Update Exam Details.
- Add new links.
- Remove outdated links.

* Update comptia-network.md

- Update Exam Details.
- Preparation Resources.
- New links.

* Update dnssec.md

- summarized content.
- relevant links.

* Update apt.md

- New section
- Added a new link

* Update comptia-a.md

- Updated Professor Messer's link
- New links added

* Apply suggestions from code review

* Update attck.md

- new content.
- relevant links.

* Update src/data/roadmaps/cyber-security/content/attck@auR7fNyd77W2UA-PjXeJS.md

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Co-authored-by: dsh <daniel.s.holdsworth@gmail.com>
Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

src/data/roadmaps/cyber-security/content/attck@auR7fNyd77W2UA-PjXeJS.md

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+# ATT&CK
+
+MITRE ATT&CK® stands for Adversarial Tactics, Techniques & Common Knowledge. 
+
+MITRE ATT&CK documents various strategies, methods, and processes employed by adversaries at every stage of a cybersecurity incident, from the reconnaissance and strategizing phase to the final implementation of the attack. 
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+The insights provided by MITRE ATT&CK can empower security professionals and teams to enhance their defensive strategies and responses against potential threats.
+
+This framework was created by the non-profit organization MITRE Corporation and is continuously updated with contributions from cybersecurity experts worldwide.
+
+Learn more from the following resources:
+
+- [@official@MITRE ATT&CK®](https://attack.mitre.org/)
+- [@video@MITRE ATT&CK Framework](https://www.youtube.com/watch?v=Yxv1suJYMI8)
+- [@video@Introduction To The MITRE ATT&CK Framework](https://www.youtube.com/watch?v=LCec9K0aAkM)