Fix/dqn example

[KaleabTessera]

This PR includes two fixes for the dqn example:

1. Fix import error:

   Traceback (most recent call last):
     File "examples/simple_dqn.py", line 28, in <module>
       from rlax.examples import experiment
   ModuleNotFoundError: No module named 'rlax.examples'
   

   There is already a PR for this, but this fixes the whole dqn example.

2. Fix epsilon scheduling (Epsilon keeps getting reintialized in the example script #102).

   These lines (1 , 2) reset the actor steps, which results in the wrong counts being passed to the eps scheduling function here. This outcome of this is a cyclic eps schedule which is not intended.