docs: update hidden marketplace links

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Author: MariusStorhaug

.github/plugin/README.md

@@ -13,7 +13,7 @@ copilot plugin install psmodule-process
 ```
 
 The plugin provides the
-[`pester-migration`](../../plugins/psmodule-process/skills/pester-migration/SKILL.md)
+[`pester-migration`](./plugins/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:
 
@@ -24,4 +24,4 @@ copilot plugin list
 
 The marketplace manifest is
 [`marketplace.json`](./marketplace.json); plugin metadata is in
-[`plugin.json`](../../plugins/psmodule-process/plugin.json).
+[`plugin.json`](./plugins/psmodule-process/plugin.json).

.github/plugin/marketplace.json

@@ -12,7 +12,7 @@
       "name": "psmodule-process",
       "description": "PSModule process guidance and reusable skills for PowerShell module repositories.",
       "version": "1.0.0",
-      "source": "plugins/psmodule-process"
+      "source": ".github/plugin/plugins/psmodule-process"
     }
   ]
 }