Documentation for v0.1 version (#199)

* Adding Equations, solving typos
* improve _code.rst
* the team rst and restuctore index.rst
* fixing errors

---------

Co-authored-by: Dario Coscia <dariocoscia@dhcp-015.eduroam.sissa.it>

docs/source/_rst/solvers/garom.rst

@@ -0,0 +1,7 @@
+GAROM
+======
+.. currentmodule:: pina.solvers.garom
+
+.. autoclass:: GAROM
+   :members:
+   :show-inheritance:

docs/source/_rst/solvers/pinn.rst

@@ -1,10 +1,7 @@
 PINN
-====
+======
 .. currentmodule:: pina.solvers.pinn
 
-.. automodule:: pina.solvers.pinn
-
 .. autoclass:: PINN
    :members:
-   :private-members:
    :show-inheritance:

docs/source/_rst/solvers/solver_interface.rst

@@ -1,10 +1,7 @@
 SolverInterface
-===========
+=================
 .. currentmodule:: pina.solvers.solver
 
-.. automodule:: pina.solvers.solver
-
 .. autoclass:: SolverInterface
-    :members:
     :show-inheritance:
-    :noindex:
+    :members:

docs/source/_rst/solvers/supervised.rst

@@ -0,0 +1,7 @@
+SupervisedSolver
+===================
+.. currentmodule:: pina.solvers.supervised
+
+.. autoclass:: SupervisedSolver
+   :members:
+   :show-inheritance: