package.json: add go.showWelcome

This new setting controls whether to show the Welcome
on first install.

Based on GitHub-Pull-Request: golang/vscode-go#2704
Hana Kim ran `go run tools/generate.go` to update
docs/settings.md.

Change-Id: I30a4c5fd6066b4c5e3052ba3d75e47e6b52a4a76
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/501208
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>
Auto-Submit: Hyang-Ah Hana Kim <hyangah@gmail.com>
Reviewed-by: Suzy Mueller <suzmue@golang.org>
TryBot-Result: kokoro <noreply+kokoro@google.com>

docs/settings.md

@@ -449,6 +449,11 @@ Default:
 	"tags" :	"",
 }
 ```
+### `go.showWelcome`
+
+Specifies whether to show the Welcome experience on first install
+
+Default: `true`
 ### `go.survey.prompt`
 
 Prompt for surveys, including the gopls survey and the Go developer survey.

package.json

@@ -1113,6 +1113,11 @@
       "type": "object",
       "title": "Go",
       "properties": {
+        "go.showWelcome": {
+          "type": "boolean",
+          "default": true,
+          "description": "Specifies whether to show the Welcome experience on first install"
+        },
         "go.buildOnSave": {
           "type": "string",
           "enum": [

src/welcome.ts

@@ -31,7 +31,7 @@ export class WelcomePanel {
 		}
 
 		// Show the Go welcome page on update.
-		if (!extensionInfo.isInCloudIDE) {
+		if (!extensionInfo.isInCloudIDE && vscode.workspace.getConfiguration('go.showWelcome')) {
 			showGoWelcomePage();
 		}
 	}