deleting some really old doc

doc/Makefile.am

@@ -1,5 +0,0 @@
-# doc
-
-pkgdatadir   = $(datadir)/doc/$(PACKAGE)/
-
-EXTRA_DIST   = conventions.txt implementation.txt robots.txt challenges_dependencies.odg

doc/robots.txt

@@ -1,15 +0,0 @@
-To create a robot, here is what you should do:
-
-- There is a template for the robots in the src/robots directory, modify it
-  to create your own robot, the files are named empty_robot.cpp and
-  empty_robot.hpp .
-- Name your source file <name of robot>_robot.cpp, and your header as
-  <name of robot>_robot.hpp .
-- Place your source and header file in the src/robot/ directory.
-- Add your filenames to the Makefile.am in the src/ directory.
-- In the file src/world.cpp, under the group of #includes, add
-  #include "robots/<header file name>", then add your robot inside
-  function World::loadRobot to the switch statement as the next case
-  available, and increase the constant NUM_ROBOTS by one.
-- To test it, run 'sh reconf.sh'. It should reconfigure your build and then
-  compile STK.