Clean up old HZDR-Gitlab-daily and HZDR-Mattermost-daily subprojects

.gitmodules

 [submodule "AAI"]
 	path = subprojects/AAI
 	url = ../helmholtz-aai.git
-[submodule "subprojects/HZDR-Gitlab-Mattermost"]
-	path = subprojects/HZDR-Gitlab-Mattermost
-	url = ../../../../fwcc-management/gitlab-statistics.git
 [submodule "subprojects/helmholtz-backbone-vpn"]
 	path = subprojects/helmholtz-backbone-vpn
 	url = ../helmholtz-backbone-vpn.git

data/hzdr_gitlab_users_daily/data.csv

-../../subprojects/HZDR-Gitlab-Mattermost/stats/active_users.csv
\ No newline at end of file

data/hzdr_mattermost_daily/data.csv

-../../subprojects/HZDR-Gitlab-Mattermost/stats/mattermost_statistics.csv
\ No newline at end of file

gallery/gallery.md

@@ -212,39 +212,9 @@
 ##### hzdr_codebase_project_statistics-plot_9.svg
 ![hzdr_codebase_project_statistics-plot_9.svg](https://gitlab.hzdr.de/hifis/overall/kpi/kpi-plots-ci/-/jobs/artifacts/master/raw/plots/svg/hzdr_codebase_project_statistics-plot_9.svg?job=plot_general)
 
-##### hzdr_gitlab_users_daily-plot_2.svg
-![hzdr_gitlab_users_daily-plot_2.svg](https://gitlab.hzdr.de/hifis/overall/kpi/kpi-plots-ci/-/jobs/artifacts/master/raw/plots/svg/hzdr_gitlab_users_daily-plot_2.svg?job=plot_general)
-
-##### hzdr_gitlab_users_daily-plot_3.svg
-![hzdr_gitlab_users_daily-plot_3.svg](https://gitlab.hzdr.de/hifis/overall/kpi/kpi-plots-ci/-/jobs/artifacts/master/raw/plots/svg/hzdr_gitlab_users_daily-plot_3.svg?job=plot_general)
-
-##### hzdr_gitlab_users_daily-plot_4.svg
-![hzdr_gitlab_users_daily-plot_4.svg](https://gitlab.hzdr.de/hifis/overall/kpi/kpi-plots-ci/-/jobs/artifacts/master/raw/plots/svg/hzdr_gitlab_users_daily-plot_4.svg?job=plot_general)
-
-##### hzdr_gitlab_users_daily-plot_5.svg
-![hzdr_gitlab_users_daily-plot_5.svg](https://gitlab.hzdr.de/hifis/overall/kpi/kpi-plots-ci/-/jobs/artifacts/master/raw/plots/svg/hzdr_gitlab_users_daily-plot_5.svg?job=plot_general)
-
-##### hzdr_gitlab_users_daily-plot_6.svg
-![hzdr_gitlab_users_daily-plot_6.svg](https://gitlab.hzdr.de/hifis/overall/kpi/kpi-plots-ci/-/jobs/artifacts/master/raw/plots/svg/hzdr_gitlab_users_daily-plot_6.svg?job=plot_general)
-
-##### hzdr_gitlab_users_daily-plot_7.svg
-![hzdr_gitlab_users_daily-plot_7.svg](https://gitlab.hzdr.de/hifis/overall/kpi/kpi-plots-ci/-/jobs/artifacts/master/raw/plots/svg/hzdr_gitlab_users_daily-plot_7.svg?job=plot_general)
-
 ##### hzdr_helpdesk-plot_2.svg
 ![hzdr_helpdesk-plot_2.svg](https://gitlab.hzdr.de/hifis/overall/kpi/kpi-plots-ci/-/jobs/artifacts/master/raw/plots/svg/hzdr_helpdesk-plot_2.svg?job=plot_general)
 
-##### hzdr_mattermost_daily-plot_2.svg
-![hzdr_mattermost_daily-plot_2.svg](https://gitlab.hzdr.de/hifis/overall/kpi/kpi-plots-ci/-/jobs/artifacts/master/raw/plots/svg/hzdr_mattermost_daily-plot_2.svg?job=plot_general)
-
-##### hzdr_mattermost_daily-plot_3.svg
-![hzdr_mattermost_daily-plot_3.svg](https://gitlab.hzdr.de/hifis/overall/kpi/kpi-plots-ci/-/jobs/artifacts/master/raw/plots/svg/hzdr_mattermost_daily-plot_3.svg?job=plot_general)
-
-##### hzdr_mattermost_daily-plot_4.svg
-![hzdr_mattermost_daily-plot_4.svg](https://gitlab.hzdr.de/hifis/overall/kpi/kpi-plots-ci/-/jobs/artifacts/master/raw/plots/svg/hzdr_mattermost_daily-plot_4.svg?job=plot_general)
-
-##### hzdr_mattermost_daily-plot_5.svg
-![hzdr_mattermost_daily-plot_5.svg](https://gitlab.hzdr.de/hifis/overall/kpi/kpi-plots-ci/-/jobs/artifacts/master/raw/plots/svg/hzdr_mattermost_daily-plot_5.svg?job=plot_general)
-
 ##### hzdr_mattermost-plot_2.svg
 ![hzdr_mattermost-plot_2.svg](https://gitlab.hzdr.de/hifis/overall/kpi/kpi-plots-ci/-/jobs/artifacts/master/raw/plots/svg/hzdr_mattermost-plot_2.svg?job=plot_general)
 

DESY-notes @ b0b15959

-Subproject commit 178099198b1575525921f809482ce44c83a4ab6b
+Subproject commit b0b159597a98f32c59241a5163774901229acb2e

HZDR-Gitlab-Mattermost @ c8a5bf4c

-Subproject commit c8a5bf4c05b7aa326c4ebe29ddebbae3d85ab4b1