feat: Added documentation for OHIF-v3 (#2450)

* Added docs with new screenshots

* Added doc to architecture

* Added documentations to various extension modules

* Added more documentation to modes

* Added docs to managers

* Added docs for services

* Fixed deployment docs

* Added white labelling documentation

* Added i18n docs and measurement export

docs/latest/services/data/index.md

@@ -0,0 +1,54 @@
+# Services (default)
+
+
+
+## Overview
+Data services are the first category of services which deal with handling non-ui related state
+Each services have their own internal state which they handle.
+
+
+> We have replaced the *redux* store. Instead we have introduced various services and a pub/sub pattern to subscribe and run, which makes the `OHIF-v3` architecture nice and clean.
+
+
+We maintain the following non-ui Services:
+
+- [DicomMetadata Store](./../data/DicomMetadataStore.md)
+- [DisplaySet Service](./../data/DisplaySetService.md)
+- [Hanging Protocol Service](../data/HangingProtocolService.md)
+- [Toolbar Service](../data/ToolbarService.md)
+- [Measurement Service](../data/MeasurementService.md)
+
+
+
+
+## Service Architecture
+
+![services-data](../../assets/img/services-data.png)
+
+
+> We have explained services and how to create a custom service in the [`ServiceManager`](../../managers/service.md) section of the docs
+
+To recap: The simplest service return a new object that has a `name` property, and `Create` method which instantiate the service class. The "Factory
+Function" that creates the service is provided with the implementation (this is
+slightly different for UI Services).
+
+```js
+// extensions/customExtension/src/services/backEndService/index.js
+import backEndService from './backEndService';
+
+export default function WrappedBackEndService(serviceManager) {
+  return {
+    name: 'myService',
+    create: ({ configuration = {} }) => {
+      return new backEndService(serviceManager);
+    },
+  };
+}
+```
+
+A service, once created, can be registered with the `ServicesManager` to make it
+accessible to extensions. Similarly, the application code can access named
+services from the `ServicesManager`.
+
+
+[Read more of how to design a new custom service and register it](../../managers/service.md)