feat: Adding missing integrations and info for people integrating their services with Apify (#915)

- Added missing integrations to
https://docs.apify.com/platform/integrations
- Removed + redirected GPT plugin
- Added info for 3rd SaaS apps that want to integrate with us

@jancurn adding you as GPT plugin was yours and also as it was your idea
to add this page. Once done content-wise, Ill add Theo.

---------

Co-authored-by: TCMO <[email protected]>

Author: mtrunkat

nginx.conf

@@ -286,4 +286,8 @@ server {
   rewrite ^/platform/actors/development/continuous-integration$  /platform/actors/development/deployment/continuous-integration redirect;
   rewrite ^/platform/actors/development/testing-and-maintenance$ /platform/actors/development/deployment/automated-tests redirect;
   rewrite ^/platform/actors/development/source-code$             /platform/actors/development/deployment/source-types redirect;
+
+  # Removed pages
+  # GPT plugins were discontinued April 9th, 2024 - https://help.openai.com/en/articles/8988022-winding-down-the-chatgpt-plugins-beta
+  rewrite ^/platform/integrations/chatgpt-plugin$            https://blog.apify.com/add-custom-actions-to-your-gpts/ redirect;
 }

sources/platform/integrations/chatgpt.md

@@ -21,6 +21,8 @@ import CardGrid from "@site/src/components/CardGrid";
 
 Integrations allow you to combine separate applications and take advantage of their combined capabilities. Automation of these online processes increases your productivity. That's why we made Apify in a way that allows you to connect it with practically any cloud service or web app and make it part of your larger projects.
 
+If you are building a service and your users could benefit from integrating with Apify or wise-versa then ready the [integrate with Apify](./integrate_with_apify.md).
+
 ## Built-in integrations
 
 Apify‘s RESTful API allows you to interact with the platform programmatically. HTTP webhooks notify you and your services when important events happen. By using the API, you can start Actors, retrieve their results, or basically do anything you can do on a platform UI
@@ -120,6 +122,12 @@ If you use one of the main automation platforms, Apify support is here for you.
         imageUrl="/img/platform/integrations/transposit.svg"
         smallImage
     />
+    <Card
+        title="Telegram (via Zapier)"
+        to="./integrations/telegram"
+        imageUrl="/img/platform/integrations/telegram.svg"
+        smallImage
+    />
 </CardGrid>
 
 
@@ -158,6 +166,18 @@ If you are working on an AI/LLM-related project, we recommend you look into the
         imageUrl="/img/platform/integrations/langchain.png"
         smallImage
     />
+    <Card
+        title="Llamaindex"
+        to="./integrations/llama"
+        imageUrl="/img/platform/integrations/llamaindex.jpeg"
+        smallImage
+    />
+    <Card
+        title="Flowise"
+        to="./integrations/flowise"
+        imageUrl="/img/platform/integrations/Flowise.png"
+        smallImage
+    />
 </CardGrid>
 
 ## Other Actors

sources/platform/integrations/images/airbyte-sources-web.png

@@ -0,0 +1,36 @@
+---
+title: Integrate with Apify 🤝
+sidebar_label: Integrate with Apify
+description: Learn about how to integrate your service with Apify to benefit from a mutual integration.
+sidebar_position: 90.00
+slug: /integrations/integrate
+---
+
+If you are building a service and your users could benefit from integrating with Apify or vice versa, we would love to hear from you! Contact us at [[email protected]](mailto:[email protected]) to discuss potential collaboration. We are always looking for ways to make our platform more useful and powerful for our users. Here are some examples of services and tools integrating with Apify:
+
+- [Langchain](./langchain.md) integration enables developers to build their projects, such as AI chatbots, with Langchain to feed them with data from the web easily.
+- [Zapier](./zapier.md) integration allows Zapier users to enrich their automation workflows with data from the web or to add additional Actions performed by [Apify Actors](https://apify.com/store).
+- [Keboola](https://help.apify.com/en/articles/2003234-keboola-integration) integration enables Keboola users to easily pull data crawled from the web into their data pipelines.
+
+and many more that you can see at [integrations](./index.mdx).
+
+## Integrating with Apify
+
+To integrate your service with Apify, you have two options. You can either:
+
+- build an [Apify actor](https://apify.com/docs/actor) that will be used as integration within the [Apify Console](https://console.apify.com)
+- build an external integration, such as [Zapier](./zapier.md).
+
+![Integration-ready Actors](./images/integration-ready-actors.png)
+
+### Building an integration Actor
+
+The best way to reach out to Apify users is directly within [Apify Console](https://console.apify.com). To do that, you need to build an integrable Actor that can be piped into other Actors to upload existing data into a database. This can then be easily configured within Apify Console. Follow the [guide on building integration-ready Actors](./actors/integration_ready_actors.md).
+
+### Building an external integration
+
+Alternatively, you can let your users manage the connection directly on your side using [Apify API](https://docs.apify.com/api/v2) and our API clients for [JavaScript](/api/client/js/) or [Python](/api/client/python/). This way, you can provide a seamless experience for your users and let them manage the connection directly from your service.
+
+For inspiration, take a look at the public repositories of our existing external integrations [Zapier](https://github.com/apify/apify-zapier-integration) or [Keboola](https://github.com/apify/keboola-ex-apify) both done in JavaScript or [Airbyte](https://github.com/airbytehq/airbyte/tree/master/airbyte-integrations/connectors/source-apify-dataset) written in Python.
+
+![Airbyte sources tab](./images/airbyte-sources-web.png)