Update project installation guide for CPM support

[NguyenThuyLan]

📋 Description

• Added info hint about Central Package Management (CPM) being the default since version 17.3.0
• Updated Visual Studio project creation screenshots to reflect the latest UI
• Referenced official Microsoft CPM documentation

📎 Related Issues (if applicable)

umbraco/Umbraco-CMS#21641

✅ Contributor Checklist

I've followed the Umbraco Documentation Style Guide and can confirm that:

• Code blocks are correctly formatted.
• Sentences are short and clear (preferably under 25 words).
• Passive voice and first-person language (“we”, “I”) are avoided.
• Relevant pages are linked.
• All links work and point to the correct resources.
• Screenshots or diagrams are included if useful.
• Any code examples or instructions have been tested.
• Typos, broken links, and broken images are fixed.

Product & Version (if relevant)

Deadline (if relevant)

📚 Helpful Resources

• 🧾 Umbraco Contribution Guidelines
• ✍️ Umbraco Documentation Style Guide

[AndyButland]

Look good to me @NguyenThuyLan, thanks - fine for me once you've looked at the two comments I made.

[sofietoft]

This is for the 17.3 release next week, right? Please mention that in the description @NguyenThuyLan 💪