Hype up Kestrel overview page in documentation

[JamesNK]

Kestrel is really cool. The Kestrel overview page in our docs is really meh - Kestrel web server implementation in ASP.NET Core. It needs to be brought up to date with recently added features and reflect our opinion that it's the number one server.

Bring the hype:

• [x] Recommended ASP.NET Core server
• [x] HTTP/3
• [ ] High performance (Tech Empower results)
• [ ] Lots of cool middleware
• [x] Lots of cool app frameworks (RESTful Web APIs, gRPC, SignalR, Blazor Server)
• [ ] Lots of cool real-world apps using it (YARP, 1st party MS apps, popular 3rd party customer apps)
• [x] Move Kestrel page's table of contents position above IIS.

[gfoidl]

You forgot another bullet:

• Lots of cool developers

😄

[adityamandaleeka]

cc @samsp-msft

[ghost]

Thanks for contacting us.

We're moving this issue to the .NET 8 Planning milestone for future evaluation / consideration. We would like to keep this around to collect more feedback, which can help us with prioritizing this work. We will re-evaluate this issue, during our next planning meeting(s). If we later determine, that the issue has no community involvement, or it's very rare and low-impact issue, we will close it - so that the team can focus on more important and high impact issues. To learn more about what to expect next and how this issue will be handled you can read more about our triage process here.

[JamesNK]

Related: Add a top-level Servers section in TOC and move Kestrel, IIS and HTTP.sys #28988