fix: add GitHub Pages deployment workflow to publish Docsify site from main

[Copilot]

Blog Post Submission

Summary

The web-app-deploy.yml workflow only triggered on the web_app branch and used MkDocs (with no mkdocs.yml present), leaving the Docsify site on main — including the new blog section — never deployed. Added .github/workflows/deploy-pages.yml which pushes the site to the gh-pages branch on every push to main using peaceiris/actions-gh-pages@v4, excluding .github, .git, and template_repository from the published output.

Checklist

• I added my post under blog/posts/ with filename format YYYY-MM-DD-short-title.md
• I used the metadata schema from blog/_template.md (title, author, date, tags, summary)
• My post is original and relevant to the 90DaysOfDevOps community topics
• I verified local markdown links and image paths
• I have read and followed CONTRIBUTING.md

[github-actions]

Our team will soon review your PR. Thanks @Copilot :)

[github-actions]

Thank you @Copilot for taking out your valuable time in order to contribute to our project. Looking forward for more such amazing contributions :)