seo: cleanup and optimize roadmap(s) metadata (#8828)

* audit first 11 roadmaps

* audit next 10 roadmaps

* audit next 15 roadmaps

* audit last 22 roadmaps

* Update src/data/roadmaps/ai-data-scientist/ai-data-scientist.md

* Update src/data/roadmaps/aspnet-core/aspnet-core.md

* apply suggestions from code review

* fix seo title

* Update src/data/roadmaps/frontend/frontend.md

* Update src/data/roadmaps/backend/backend.md

---------

Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

src/data/roadmaps/linux/linux.md

@@ -19,7 +19,7 @@ schema:
   datePublished: '2024-04-24'
   dateModified: '2024-04-24'
 seo:
-  title: 'Linux Roadmap - roadmap.sh'
+  title: 'Linux Roadmap'
   description: 'Step by step guide to learn Linux in 2025. We also have resources and short descriptions attached to the roadmap items so you can get everything you want to learn in one place.'
   keywords:
     - 'step by step guide for linux'
@@ -50,6 +50,7 @@ relatedRoadmaps:
   - 'devops'
   - 'backend'
   - 'docker'
+  - 'cyber-security'
 sitemap:
   priority: 1
   changefreq: 'monthly'