Build navigation2 in the same workspace as ROS2

* fixed issue 1179

* updated bringup readme, added links to external documentation, tutorials, and the nav2 slam documentation, renamed the nav2 with slam documentation

*  removed warnings

* minor edits

Using the Docker comuntiy's naming convention

* Instead of copying icons, reference them in origin package.

* Remove icon install step as well.

Handle map message even if there is no initial pose

* Add non doc directory files

* Add template.

Wait recovery

Adding functionality to launch a separate rviz instance per robot.

Use ament index to resolve rosdep install

Fix underlay parameter for install_overlay_dependencies

sleep for 50ms

Nav2 recovery server