Update doc

doc/source/index.rst

@@ -23,7 +23,6 @@ Content
    :maxdepth: 1
 	      
    gettingstarted
-   overview/index
    tutorials/index
    references/index
    tests/index

doc/source/tutorials/index.rst

@@ -75,23 +75,3 @@ Finally our agent is ready to fly for a number of step or until its velocity is
 
 .. literalinclude:: examples/asv_homing_grid.py
    :lines: 54-55
-
-In close loop
-~~~~~~~~~~~~~
-
-Catchment area of ASV
----------------------
-To calculate the catchment area of homing method for a given goal location, \
-the agent should be displaced multiple time at different location, and obsverve \
-if the agent returned home or not. If it did, then the point in space from which the \
-agent started its return trip is part of the catchment area.
-
-When the agent is restricted to move a grid, and its motion at a given place, only \
-depends on the current surrounding, then to calculate a catchment area one only to \
-build a graph of motion and check how many points converge to it. 
-
-Comparing modalities
---------------------
-
-Comparing models
-----------------