Tancik/update docs (#12)

Update docs structure.

docs/reference/field_modules/embeddings.rst

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+.. _embeddings:
+
+Embeddings
+===================
+
+.. automodule:: pyrad.nerf.field_modules.embedding
+   :members:
+   :show-inheritance:

docs/reference/field_modules/encodings.rst

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+.. _encodings:
+
+Encodings
+===================
+
+.. automodule:: pyrad.nerf.field_modules.encoding
+   :members:
+   :show-inheritance:

docs/reference/field_modules/field_heads.rst

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+.. _field_heads:
+
+Field Heads
+===================
+
+.. automodule:: pyrad.nerf.field_modules.field_heads
+   :members:
+   :show-inheritance:

docs/reference/field_modules/field_losses.rst

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+.. _field_losses:
+
+Field Losses
+===================
+
+.. automodule:: pyrad.nerf.field_modules.field_losses
+   :members:
+   :show-inheritance:

docs/reference/field_modules/index.rst

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+.. _field_modules:
+
+Field Modules
+===================
+
+TODO: High level description of field modules and how they connect together.
+
+.. toctree::
+
+   encodings
+   embeddings
+   field_heads
+   field_losses
+   mlp

docs/reference/field_modules/mlp.rst

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+.. _mlp:
+
+MLP
+===================
+
+.. automodule:: pyrad.nerf.field_modules.mlp
+   :members:
+   :show-inheritance: