Add the video walkthrough link to the page (#11125)

Author: bilgeyucel

docs-website/docs/concepts/integrations.mdx

@@ -44,6 +44,8 @@ The most common types of integrations are custom components and Document Stores.
 - [Creating Custom Components](components/custom-components.mdx)
 - [Creating Custom Document Stores](document-store/creating-custom-document-stores.mdx)
 
+Check out the [video walkthrough](https://www.youtube.com/watch?v=SWC0QecAMcI) for a step-by-step guide on how to use the [custom-component template](https://github.com/deepset-ai/custom-component) to create a Haystack integration.
+
 ## How do I showcase my integration?
 
 To make your integration visible to the Haystack community, contribute it to our [haystack-integrations](https://github.com/deepset-ai/haystack-integrations) GitHub repository. There are several requirements you have to follow:

docs-website/versioned_docs/version-2.27/concepts/integrations.mdx

@@ -44,6 +44,8 @@ The most common types of integrations are custom components and Document Stores.
 - [Creating Custom Components](components/custom-components.mdx)
 - [Creating Custom Document Stores](document-store/creating-custom-document-stores.mdx)
 
+Check out the [video walkthrough](https://www.youtube.com/watch?v=SWC0QecAMcI) for a step-by-step guide on how to use the [custom-component template](https://github.com/deepset-ai/custom-component) to create a Haystack integration.
+
 ## How do I showcase my integration?
 
 To make your integration visible to the Haystack community, contribute it to our [haystack-integrations](https://github.com/deepset-ai/haystack-integrations) GitHub repository. There are several requirements you have to follow: