Move docs/armem to doxygen doc

docs/armem/README.md

...ry_servers_and_segments/RobotState/Localization/README.md

..._memory_servers_and_segments/RobotState/Mapping/README.md

.../RobotState/Mapping/res/transformations_frames-Page-2.png

docs/armem/introduction/README.md

...y_servers_and_segments/RobotState/localization/frames.png

...d_segments/RobotState/localization/localization-armem.png

...ng_memory_servers_and_segments/RobotState/localization.md

etc/doxygen/pages/armem/existing_servers_segments.md

...rmem/how_to_create_a_new_core_segment_or_memory_server.md

etc/doxygen/pages/armem/introduction.md

etc/doxygen/pages/armem/memory_system.md