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/userManuals/index.md

@@ -0,0 +1,19 @@
+# Overview
+Our documentations in this section is tailored toward the end-user. Developers
+can skip this section and visit the development section.
+In this section, we explore various core functionalities and use cases that `OHIF viewer`
+provides. In order to follow the guides below, you need to have a running instance
+of the viewer.
+
+
+- [Study List](./studyList/index.md)
+  - [Filters](./studyList/index.md#filters)
+  - [Study Summary](./studyList/index.md#study-summary)
+  - [Study-specific modes](./studyList/index.md#study-specific-modes)
+- [Viewer (Basic Viewer)](./viewer/index.md)
+  - [Overview](./viewer/index.md#overview)
+  - [Study Panel](./viewer/studyPanel/study-panel.md#overview)
+  - [Measurement Panel](./viewer/measurementPanel/measurement-panel.md#overview)
+  - [Viewport](./viewer/viewport/viewport.md#overview)
+  - [Toolbar](./viewer/toolbar/toolbar.md#overview)
+  - [HotKeys](./viewer/hotkeys/hotkeys.md#overview)