Tutorials and Doc (#191)

* Tutorial doc update
* update doc tutorial
* doc not compiling

---------

Co-authored-by: Dario Coscia <dcoscia@euclide.maths.sissa.it>
Co-authored-by: Dario Coscia <dariocoscia@Dario-Coscia.local>

docs/source/_rst/models/deeponet.rst

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+DeepONet
+===========
+.. currentmodule:: pina.model.deeponet
+
+.. automodule:: pina.model.deeponet
+
+.. autoclass:: DeepONet
+   :members:
+   :private-members:
+   :show-inheritance:

docs/source/_rst/models/fnn.rst

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+FeedForward
+===========
+.. currentmodule:: pina.model.feed_forward
+
+.. automodule:: pina.model.feed_forward
+
+.. autoclass:: FeedForward
+   :members:
+   :private-members:
+   :show-inheritance:

docs/source/_rst/models/fnn_residual.rst

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+ResidualFeedForward
+===========
+.. currentmodule:: pina.model.feed_forward
+
+.. automodule:: pina.model.feed_forward
+
+.. autoclass:: ResidualFeedForward
+   :members:
+   :private-members:
+   :show-inheritance:

docs/source/_rst/models/fno.rst

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+FNO
+===========
+.. currentmodule:: pina.model.fno
+
+.. automodule:: pina.model.fno
+
+.. autoclass:: FNO
+   :members:
+   :private-members:
+   :show-inheritance:

docs/source/_rst/models/multifeedforward.rst

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+MultiFeedForward
+================
+.. currentmodule:: pina.model.multi_feed_forward
+
+.. automodule:: pina.model.multi_feed_forward
+
+.. autoclass:: MultiFeedForward
+    :members:
+    :private-members:
+    :show-inheritance:

docs/source/_rst/models/network.rst

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+Network
+================
+.. currentmodule:: pina.model.network
+
+.. automodule:: pina.model.network
+
+.. autoclass:: Network
+    :members:
+    :private-members:
+    :show-inheritance: