chore: strengthen blog and case study internal links

[LindsayB610]

what

• Add contextual internal links across Terraform/OpenTofu foundations, architecture, performance, automation, and AI content.
• Connect relevant blog guidance with Cursor and Power Digital case-study proof.
• Refresh modification dates on updated blog posts.

why

• Help readers move from a specific problem to the next useful guide or real-world outcome.
• Strengthen topic clusters without forcing unrelated archive content into the navigation.

references

• No related GitHub issue.

[netlify]

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[gberenice]

LGTM!

[Gowiem]