Update external install deep links (#2499)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: aaronpowell <434140+aaronpowell@users.noreply.github.com>

website/src/components/pages/PluginInstall.astro

@@ -8,7 +8,7 @@
  */
 export interface PluginInstallProps {
   isExternal?: boolean;
-  /** awesome-copilot plugin id (internal installs). */
+  /** awesome-copilot plugin id. */
   pluginId?: string | null;
   /** Upstream marketplace source (owner/repo or git URL) for external installs. */
   externalSource?: string | null;
@@ -36,6 +36,11 @@ let insidersUrl: string | null = null;
 let ghappUrl: string | null = null;
 
 if (isExternal) {
+  if (pluginId) {
+    ghappUrl = `ghapp://plugins/install?source=${encodeURIComponent(
+      `${pluginId}@${MARKETPLACE}`
+    )}`;
+  }
   if (externalSource) {
     vscodeUrl = `vscode://chat-plugin/install?source=${encodeURIComponent(
       externalSource
@@ -43,9 +48,6 @@ if (isExternal) {
     insidersUrl = `vscode-insiders://chat-plugin/install?source=${encodeURIComponent(
       externalSource
     )}`;
-    ghappUrl = `ghapp://plugins/marketplace/add?source=${encodeURIComponent(
-      externalSource
-    )}`;
   }
 } else if (pluginId) {
   const plugin = encodeURIComponent(pluginId);

website/src/pages/extension/[id].astro

@@ -264,6 +264,7 @@ if (!isExternal && item.ref) {
               <PluginInstall
                 slot="install"
                 isExternal={true}
+                pluginId={item.pluginName ?? item.id}
                 externalSource={externalSource || null}
                 label="Install this extension"
                 note="This extension is maintained in an external repository."

website/src/pages/plugin/[id].astro

@@ -219,7 +219,7 @@ if (isExternal) {
             installCommand={installCommand}
             label={isExternal ? "Install this plugin" : "Install"}
             note={isExternal
-              ? "This plugin is maintained in an external repository. Installing it adds the third-party marketplace before installing."
+              ? "This plugin is maintained in an external repository."
               : undefined}
           />
         </Sidebar>

website/src/scripts/pages/extensions-render.ts

@@ -100,9 +100,9 @@ export function renderExtensionsHtml(items: RenderableExtension[]): string {
       const pluginId = item.pluginName || item.id;
       const ghappInstallUrl =
         item.external
-          ? externalSource
-            ? `ghapp://plugins/marketplace/add?source=${encodeURIComponent(
-                externalSource
+          ? pluginId
+            ? `ghapp://plugins/install?source=${encodeURIComponent(
+                `${pluginId}@awesome-copilot`
               )}`
             : ""
           : pluginId