Improve IaC tools article balance and messaging

- Reframe introduction from competitive to evolutionary perspective
- Add clear categorization distinguishing IaC tools from config management/automation platforms
- Balance tool assessments by acknowledging competitor strengths and specific use cases
- Add context to performance claims and migration timelines
- Improve FAQ section with more neutral guidance while maintaining Pulumi advocacy
- Replace loaded language with objective terminology throughout
- Add info notes using proper shortcode format for non-IaC tool clarifications
- Enhance conclusion to focus on industry evolution rather than just Pulumi benefits
- Update publish date to June 16, 2025
- Fix markdown linting issues with list spacing

Addresses feedback to make the article more credible and educational while maintaining
appropriate Pulumi focus for pulumi.com publication.

Author: asafashirov