Backport PR scverse#1231: Add the codebase overview schematic to docs

README.md

@@ -61,7 +61,8 @@ scvi-tools contains the building blocks to develop and deploy novel probablistic
 models. These building blocks are powered by popular probabilistic and
 machine learning frameworks such as [PyTorch
 Lightning](https://www.pytorchlightning.ai/) and
-[Pyro](https://pyro.ai/).
+[Pyro](https://pyro.ai/). For an overview of how the scvi-tools package
+is structured, you may refer to [this](https://docs.scvi-tools.org/en/stable/user_guide/background/codebase_overview.html) page.
 
 We recommend checking out the [skeleton
 repository](https://github.com/YosefLab/scvi-tools-skeleton) as a

docs/user_guide/background/codebase_overview.rst

@@ -0,0 +1,11 @@
+===================================
+Overview of the scvi-tools codebase 
+===================================
+
+Below is a static view of the scvi-tools codebase shown at the abstraction of discrete layers of components. Only select
+components are shown for each layer and only a single model is presented (scVI).
+
+.. figure:: figures/codebase_overview.svg
+   :class: img-fluid
+   :align: center
+   :alt: Codebase overview figure