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/managers/index.md

@@ -0,0 +1,25 @@
+# Managers
+
+## Overview
+
+
+`OHIF` uses `Managers` to accomplish various purposes such as registering new services, dependency injection, and aggregating and exposing `extension` features.
+
+`OHIF-v3` provides the following managers which we will discuss in depth.
+
+{% include "./_managers.md" %}
+
+
+
+
+
+<!--
+  LINKS
+  -->
+
+<!-- prettier-ignore-start -->
+
+[core-services]: https://github.com/OHIF/Viewers/tree/master/platform/core/src/services
+[services-manager]: https://github.com/OHIF/Viewers/blob/master/platform/core/src/services/ServicesManager.js
+[cross-cutting-concerns]: https://en.wikipedia.org/wiki/Cross-cutting_concern
+<!-- prettier-ignore-end -->