Add docs for recognition, user interface and exports

docs/source/conf.py

docs/source/export/export.md

docs/source/export/trajectory.md

docs/source/export/video.md

docs/source/index.md

docs/source/misc/FAQ.md

docs/source/misc/combine.md

docs/source/misc/misc.md

docs/source/recognition/aruco.md

docs/source/recognition/images/aruco_viz.png

docs/source/recognition/images/aurco_options.png

docs/source/recognition/images/color_picker_example.webp

docs/source/recognition/images/color_plot.png

docs/source/recognition/images/color_range_dialog.png

docs/source/recognition/images/color_range_example.webp

docs/source/recognition/images/color_selection.png

docs/source/recognition/images/general_settings.png

docs/source/recognition/images/height_options.png

docs/source/recognition/images/maps2.png

docs/source/recognition/images/multicolor_param_win.png