Docs: Re-organize samples and create a samples-hub

[dishaprakash]

Description

This PR re-organizes the docs to place samples specific to integrations under /integrations and moves the quickstarts (mcp, toolbox sdks) into getting-started. The rest of the samples continue to stay under the 3rd section, now renamed into samples-hub.

This samples hub now contains a searchable page for samples.

PR Checklist

Thank you for opening a Pull Request! Before submitting your PR, there are a
few things you can do to make sure it goes smoothly:

• Make sure you reviewed
  CONTRIBUTING.md
• Make sure to open an issue as a
  bug/issue
  before writing your code! That way we can discuss the change, evaluate
  designs, and agree on the general idea
• Ensure the tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)
• Make sure to add ! if this involve a breaking change

🛠️ Fixes #<issue_number_goes_here>

[github-actions]

Link Resolution Note

Local links and directory changes work differently on GitHub than on the docsite. You must ensure fixes pass the GitHub check and also work with hugo server.
See Link Checking and Fixing with Lychee for more details.

Summary

Status	Count
🔍 Total	1174
✅ Successful	883
⏳ Timeouts	0
👻 Excluded	70
❓ Unknown	0
🚫 Errors	23
⛔ Unsupported	0

Errors per input

Errors in DEVELOPER.md

• [ERROR] https://play.dgraph.io/ | Network error: Connection failed. Check network connectivity and firewall settings (error sending request for url (https://play.dgraph.io/)): Connection failed. Check network connectivity and firewall settings

Errors in docs/en/documentation/connect-to/client-sdks/javascript-sdk/core/index.md

• [404] https://langchain-ai.github.io/langgraphjs/reference/functions/langgraph_prebuilt.createReactAgent.html | Rejected status code: 404 Not Found (configurable with "accept" option)

Errors in docs/en/documentation/connect-to/ides/bigquery_mcp.md

• [ERROR] https://cloud.google.com/bigquery/docs/pre-built-tools-with-mcp-toolbox | Network error: Connection failed. Check network connectivity and firewall settings (error sending request for url (https://cloud.google.com/bigquery/docs/pre-built-tools-with-mcp-toolbox)): Connection failed. Check network connectivity and firewall settings

Errors in docs/en/documentation/connect-to/ides/cloud_sql_mssql_mcp.md

Errors in docs/en/documentation/connect-to/ides/cloud_sql_pg_admin_mcp.md

• [ERROR] https://cloud.google.com/billing/docs/how-to/verify-billing-enabled#confirm_billing_is_enabled_on_a_project | Network error: Connection failed. Check network connectivity and firewall settings (error sending request for url (https://cloud.google.com/billing/docs/how-to/verify-billing-enabled#confirm_billing_is_enabled_on_a_project)): Connection failed. Check network connectivity and firewall settings

Errors in docs/en/documentation/connect-to/mcp-client/_index.md

• [404] https://docs.windsurf.com/windsurf/mcp | Rejected status code: 404 Not Found (configurable with "accept" option)

Errors in docs/en/documentation/connect-to/toolbox-sdks/javascript-sdk/core/index.md

• [404] https://langchain-ai.github.io/langgraphjs/reference/functions/langgraph_prebuilt.createReactAgent.html | Error (cached)

Errors in docs/en/documentation/deploy-to/cloud-run/_index.md

• [ERROR] https://docs.cloud.google.com/iap/docs/concepts-overview | Network error: Connection failed. Check network connectivity and firewall settings (error sending request for url (https://docs.cloud.google.com/iap/docs/concepts-overview)): Connection failed. Check network connectivity and firewall settings

Errors in docs/en/documentation/deploy-to/kubernetes/_index.md

• [ERROR] https://cloud.google.com/kubernetes-engine/docs/concepts/cluster-architecture | Network error: Connection failed. Check network connectivity and firewall settings (error sending request for url (https://cloud.google.com/kubernetes-engine/docs/concepts/cluster-architecture)): Connection failed. Check network connectivity and firewall settings

Errors in docs/en/integrations/alloydb-admin/tools/alloydb-create-cluster.md

• [ERROR] https://console.cloud.google.com/apis/library/alloydb.googleapis.com | Network error: HTTP/2 protocol error. Server may not support HTTP/2 properly (error sending request for url (https://console.cloud.google.com/apis/library/alloydb.googleapis.com)): HTTP/2 protocol error. Server may not support HTTP/2 properly

Errors in docs/en/integrations/alloydb-admin/tools/alloydb-create-instance.md

• [ERROR] https://console.cloud.google.com/apis/library/alloydb.googleapis.com | Error (cached)

Errors in docs/en/integrations/alloydb-admin/tools/alloydb-create-user.md

• [ERROR] https://console.cloud.google.com/apis/library/alloydb.googleapis.com | Error (cached)

Errors in docs/en/integrations/alloydb/tools/alloydb-ai-nl.md

• [ERROR] https://docs.cloud.google.com/alloydb/docs/ai/use-natural-language-generate-sql-queries#create-config | Network error: Connection failed. Check network connectivity and firewall settings (error sending request for url (https://docs.cloud.google.com/alloydb/docs/ai/use-natural-language-generate-sql-queries#create-config)): Connection failed. Check network connectivity and firewall settings

Errors in docs/en/integrations/bigtable/tools/bigtable-sql.md

• [ERROR] https://cloud.google.com/bigtable/docs/googlesql-overview | Network error: Connection failed. Check network connectivity and firewall settings (error sending request for url (https://cloud.google.com/bigtable/docs/googlesql-overview)): Connection failed. Check network connectivity and firewall settings
• [ERROR] https://cloud.google.com/bigtable/docs/googlesql-overview#use-cases | Network error: Connection failed. Check network connectivity and firewall settings (error sending request for url (https://cloud.google.com/bigtable/docs/googlesql-overview#use-cases)): Connection failed. Check network connectivity and firewall settings
• [ERROR] https://cloud.google.com/bigtable/docs/manage-data-using-console | Network error: Connection failed. Check network connectivity and firewall settings (error sending request for url (https://cloud.google.com/bigtable/docs/manage-data-using-console)): Connection failed. Check network connectivity and firewall settings

Errors in docs/en/integrations/cloudhealthcare/source.md

• [ERROR] https://cloud.google.com/healthcare-api/docs/store-healthcare-data-rest | Network error: Connection failed. Check network connectivity and firewall settings (error sending request for url (https://cloud.google.com/healthcare-api/docs/store-healthcare-data-rest)): Connection failed. Check network connectivity and firewall settings

Errors in docs/en/integrations/dataplex/source.md

• [ERROR] https://cloud.google.com/dataplex/docs | Network error: Connection failed. Check network connectivity and firewall settings (error sending request for url (https://cloud.google.com/dataplex/docs)): Connection failed. Check network connectivity and firewall settings

Full Github Actions output

[github-actions]

🔎 Preview at https://googleapis.github.io/genai-toolbox/previews/PR-2767/

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