Adding OOD documentation

content/OSG/_index.md

content/anvil/_index.md

content/connecting/_index.md

content/open_ondemand/_index.md

content/open_ondemand/connecting_to_hcc_ondemand.md

content/open_ondemand/job_management_and_submission.md

content/open_ondemand/managing_and_transferring_files.md

content/open_ondemand/shell_access.md

...nt/open_ondemand/virtual_desktop_and_jupyter_notebooks.md

static/images/OOD_Active_jobs_1.png

static/images/OOD_Active_jobs_2.png

static/images/OOD_Dashboard_1.png

static/images/OOD_Delete_desktop_1.png

static/images/OOD_Desktop_1.png

static/images/OOD_Download_1.png

static/images/OOD_File_explorer_1.png

static/images/OOD_File_explorer_2.png

static/images/OOD_Files_menu_1.png

static/images/OOD_Go_to_1.png

static/images/OOD_Interactive_apps_1.png