chore(gno.land): add playground section, add GopherconUS to events pa…

…ge (#1741)

## Description

As the title says, on request by @ilgooz & marketing. Shadows
#1641.

<details><summary>Contributors' checklist...</summary>

- [ ] Added new tests, or not needed, or not feasible
- [ ] Provided an example (e.g. screenshot) to aid review or the PR is
self-explanatory
- [ ] Updated the official documentation or not needed
- [ ] No breaking changes were made, or a `BREAKING CHANGE: xxx` message
was included in the description
- [ ] Added references to related issues and PRs
- [ ] Provided any useful hints for running manual tests
- [ ] Added new benchmarks to [generated
graphs](https://gnoland.github.io/benchmarks), if any. More info
[here](https://github.com/gnolang/gno/blob/master/.benchmarks/README.md).
</details>

examples/gno.land/r/gnoland/home/home.gno

@@ -28,6 +28,9 @@ func Render(_ string) string {
 			lastContributions(4),
 		}},
 	)
+
+	dom.Body.Append(ui.HR{})
+	dom.Body.Append(playgroundSection()...)
 	dom.Body.Append(ui.HR{})
 	dom.Body.Append(packageStaffPicks()...)
 	dom.Body.Append(ui.HR{})
@@ -148,6 +151,16 @@ func socialLinks() ui.Element {
 	}
 }
 
+func playgroundSection() ui.Element {
+	return ui.Element{
+		ui.H3("[Gno Playground](https://play.gno.land)"),
+		ui.Paragraph(`Gno Playground is a web application designed for building, running, testing, and interacting
+with your Gno code, enhancing your understanding of the Gno language. With Gno Playground, you can share your code,
+execute tests, deploy your realms and packages to Gno.land, and explore a multitude of other features.`),
+		ui.Paragraph("Experience the convenience of code sharing and rapid experimentation with [Gno Playground](https://play.gno.land)."),
+	}
+}
+
 func packageStaffPicks() ui.Element {
 	// XXX: make it modifiable from a DAO
 	return ui.Element{

examples/gno.land/r/gnoland/home/home_filetest.gno

@@ -85,6 +85,19 @@ func main() {
 //
 //---
 //
+//### [Gno Playground](https://play.gno.land)
+//
+//
+//Gno Playground is a web application designed for building, running, testing, and interacting
+//with your Gno code, enhancing your understanding of the Gno language. With Gno Playground, you can share your code,
+//execute tests, deploy your realms and packages to Gno.land, and explore a multitude of other features.
+//
+//
+//Experience the convenience of code sharing and rapid experimentation with [Gno Playground](https://play.gno.land).
+//
+//
+//---
+//
 //### Explore New Packages and Realms
 //
 //<div class="columns-3">

examples/gno.land/r/gnoland/pages/page_events.gno

@@ -26,6 +26,16 @@ We’re looking to connect with developers and like-minded thinkers who can cont
 
 <div class="column">
 
+### GopherCon US
+- Come Meet Us at our Booth
+- Chicago, July 7 - 10, 2024
+
+[Learn More](https://www.gophercon.com/)
+
+</div><!-- end column-->
+
+<div class="column">
+
 ### Nebular Summit
 - Come see our talk
 - Brussels, July 12 - 13, 2024