restructure codebase pre release (#602)

* moving a lot

* building

docs/reference/api/model_components/index.rst

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+.. _graph_modules:
+
+Graph Modules
+===================
+
+TODO: High level description of graph modules and how they are used.
+
+.. toctree::
+
+   ray_sampler
+   ray_losses
+   renderers

docs/reference/api/model_components/ray_losses.rst

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+.. _ray_losses:
+
+Ray Losses
+===================
+
+.. automodule:: nerfstudio.model_components.ray_losses
+   :members:
+   :show-inheritance:

docs/reference/api/model_components/ray_sampler.rst

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+.. _ray_sampler:
+
+Ray Sampler
+===================
+
+.. automodule:: nerfstudio.model_components.ray_sampler
+   :members:
+   :show-inheritance:

docs/reference/api/model_components/renderers.rst

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+.. _renderers:
+
+Renderers
+============
+
+.. automodule:: nerfstudio.model_components.renderers
+   :members:
+   :show-inheritance: