Work in progress starting to restructure docs in preparation for next release

src/bonsai/docs/reference/topbar.rst

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+Topbar
+======
+
+For general informations about the Blender Topbar see the respective 
+`Workspaces <https://docs.blender.org/manual/en/latest/interface/window_system/topbar.html>`__ section in Blender documentation.
+
+Menus
+-----
+
+The `File` menu in the Topbar adds menu entries to Create/Open and Save an IFC project directly.
+
+.. figure:: images/interface_window_file-menue.png
+   :alt: Additional file menu options related to IFC projects
+   
+   Additional file menu options related to IFC projects.
+
+New IFC Project
+^^^^^^^^^^^^^^^
+
+The New IFC Project submenu offers several options for creating a new IFC project:
+
+.. figure:: images/file_new-ifc-project-submenu.png
+   :alt: New IFC Project submenu options
+   
+   New IFC Project submenu options
+
+- New Metric (m) Project: Creates a new IFC project using meters as the base unit.
+- New Metric (mm) Project: Creates a new IFC project using millimeters as the base unit.
+- New Imperial (ft) Project: Creates a new IFC project using feet as the base unit.
+- New Demo Project: Creates a new IFC project with pre-populated demo content.
+- New Project Wizard: Creates a default Blender project (including the default cube)
+  and opens the Scene Properties > Project Overview > Project Info tab.
+  This allows users to customize their project settings before creation.
+  Clicking the "Create Project" button in this panel will delete the default cube and set up the new IFC project with the specified settings.
+
+These options provide flexibility in setting up new IFC projects,
+allowing users to choose between quick starts with predefined units
+or a more customizable approach through the Project Wizard.
+
+
+BIM Workspace
+-------------
+
+Bonsai adds the **BIM** Workspace to the Topbar Workspaces tabs.