Add/update subprojects

.gitlab-ci.yml

.gitmodules

README.md

data/aai_active_users/data.csv

data/desy_events/data.csv

data/desy_syncnshare_consumption/data.csv

data/desy_syncnshare_users/data.csv

data/fzj_jupyter/data.csv

data/fzj_openstack/data.csv

data/hzdr_codebase_active_users/data.csv

data/hzdr_codebase_project_statistics/data.csv

data/hzdr_helpdesk/data.csv

data/hzdr_mattermost/data.csv

gallery/gallery.md

plot_general/plot.plt

plot_general/plot.sh

subprojects/AAI

subprojects/DESY-Events

subprojects/DESY-notes

subprojects/DESY-syncnshare