refactor: flatten plugin marketplace layout

Co-authored-by: Copilot App <[email protected]>

Author: MariusStorhaug

.github/plugin/README.md

@@ -18,11 +18,11 @@ copilot plugin install psmodule-process
 Install the plugin directly from this repository:
 
 ```console
-copilot plugin install PSModule/Process-PSModule:.github/plugin/plugins/psmodule-process
+copilot plugin install PSModule/Process-PSModule:.github/plugin/psmodule-process
 ```
 
 The plugin provides the
-[`pester-migration`](./plugins/psmodule-process/skills/pester-migration/SKILL.md)
+[`pester-migration`](./psmodule-process/skills/pester-migration/SKILL.md)
 skill for migrating every Pester test set in a PSModule repository to Pester
 6.1.0. Verify the installation with:
 
@@ -33,4 +33,4 @@ copilot plugin list
 
 The marketplace catalog is in [`marketplace.json`](./marketplace.json), and
 plugin metadata is in
-[`plugin.json`](./plugins/psmodule-process/plugin.json).
+[`plugin.json`](./psmodule-process/plugin.json).

.github/plugin/marketplace.json

@@ -13,7 +13,7 @@
       "name": "psmodule-process",
       "description": "PSModule process guidance and reusable skills for PowerShell module repositories.",
       "version": "1.0.0",
-      "source": "plugins/psmodule-process"
+      "source": "psmodule-process"
     }
   ]
 }

…gin/plugins/psmodule-process/plugin.json …thub/plugin/psmodule-process/plugin.json.github/plugin/plugins/psmodule-process/plugin.json renamed to .github/plugin/psmodule-process/plugin.json .github/plugin/plugins/psmodule-process/plugin.json renamed to .github/plugin/psmodule-process/plugin.json

@@ -16,7 +16,7 @@ copilot plugin install psmodule-process
 Then use its reusable `pester-migration` agent skill to migrate every Pester
 test set in a PSModule repository. For direct installation during development,
 use `copilot plugin install
-PSModule/Process-PSModule:.github/plugin/plugins/psmodule-process`. It is
+PSModule/Process-PSModule:.github/plugin/psmodule-process`. It is
 written for Pester **6.1.0** and distinguishes required compatibility changes
 from optional v6 modernization.