feat: Add apps proxy documentation

_data/navigation.yml

@@ -273,6 +273,12 @@ items:
           - url: /extend/publish/checklist/
             title: Checklist
 
+      - url: /extend/apps
+        title: Create data and inspect data apps
+        items:
+          - url: /extend/apps/proxy
+            title: Apps proxy API
+
   - url: /integrate/
     title: Integration
     items:

extend/apps/index.md

@@ -0,0 +1,27 @@
+---
+title: Apps
+permalink: /extend/apps/
+---
+
+Data Apps are simple web apps used to work with data and have an easy to use, accessible UI that enables data-driven decision making.
+
+They could be written in any language, but for starters we want to support [Streamlit language](https://streamlit.io/), which enables rapid development of these apps.
+
+To understand how the applications communicate to your application go to the [proxy](/extend/apps/proxy/) page.
+
+{% comment %} 
+
+ - gdwriter
+
+  - Storage
+    - API
+    - Curl
+    - Commandline
+  - Transformation
+    - API
+    - IO Mapping
+    - Sandbox
+  - Extractors
+    - ...
+  - Writers
+{% endcomment %}

extend/apps/proxy/index.md

@@ -0,0 +1,10 @@
+---
+title: Proxy API
+permalink: /extend/apps/proxy/
+---
+
+* TOC
+{:toc}
+
+
+

overview/api/index.md

@@ -17,6 +17,7 @@ The main APIs for our components are:
 
 | API | Description |
 |---|---|
+| [Apps Proxy API](https://hub.keboola.com/_proxy/api/v1/documentation/) | The Keboola Application proxy server for Data Applications. |
 | [Keboola Storage API](https://keboola.docs.apiary.io/) | [Storage](/integrate/storage/) is the main Keboola component storing all data. |
 | [Keboola Management API](https://keboolamanagementapi.docs.apiary.io/) | API managing Keboola projects and users (and notifications and features). |
 | [Encryption API](https://keboolaencryption.docs.apiary.io/#) | Provides [Encryption](/overview/encryption/). |