docs: enhance Google Cloud Vertex AI setup guide for Langflow (#4745)

* docs: enhance Google Cloud Vertex AI setup guide for Langflow

- Add detailed step-by-step instructions for creating a Google Cloud project
- Include instructions for creating and configuring a Service Account
- Add steps for generating and downloading a JSON key file
- Provide an example of the JSON key file structure
- Include instructions for enabling the Vertex AI API
- Add steps for configuring credentials in Langflow components
- Include relevant screenshots and GIFs to illustrate each step visually
- Improve overall clarity and completeness of the setup process

Co-authored-by: Vinícios Batista da Silva <vinicios.batsi@gmail.com>

* feat: Update Google Cloud Vertex AI integration documentation for clarity and structure

* remove-unused-images

* docs: update Google Cloud Vertex AI integration setup instructions

* docs: update Google Cloud Vertex AI integration setup instructions

---------

Co-authored-by: Mendon Kissling <59585235+mendonk@users.noreply.github.com>

docs/sidebars.js

@@ -106,10 +106,11 @@ module.exports = {
         "Integrations/integrations-langsmith",
         "Integrations/integrations-langwatch",
         {
-          type: "category",
-          label: "Google",
+          type: 'category',
+          label: 'Google',
           items: [
-            "Integrations/Google/integrations-setup-google-oauth-langflow",
+            'Integrations/Google/integrations-setup-google-oauth-langflow',
+            'Integrations/Google/integrations-setup-google-cloud-vertex-ai-langflow',
           ],
         },
         {