Update BUILD.md

bring back cleaning up individual plugins

Use setup.bash instead of local_setup.bash. Make instruction generic for all branch.

* Created a new gazebo world with randomly moving dynamic obstacles. Added a map file for the empty room.

- Dynamic obstacle Gazebo model (Randomly moving box)
- Empty room Gazebo model (20x20 meter empty room with walls)
- A gazebo world model with an empty room and 9 dynamic obstacles.

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.