feat(sitewide): add scroll to top button to conditionally appear in longer pages

[DongreJaipal]

This PR Closes Issue closes

https://github.com/AnguHashBlog/angular-primeng/issues/28

Description

long blog posts there should be a scroll to pop button / icon that returns the user to the beginning of the page for this app version primeicons used applied in the app.component

What type of PR is this? (check all applicable)

• [x] 🅰️ Feature
• [ ] 🐛 Bug Fix
• [ ] 📝 Documentation Update
• [ ] 🎨 Style
• [ ] 🧑‍💻 Code Refactor
• [ ] 🔥 Performance Improvements
• [ ] ✅ Test
• [ ] 🤖 Build
• [ ] 🔁 CI
• [ ] 📦 Chore (Release)
• [ ] ⏩ Revert

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Steps to QA

Added to documentation?

• [ ] 📜 README.md
• [x] 🙅 no documentation needed

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[monacodelisa]

@DongreJaipal thank you for your contribution 🚀