update README.md and conf.py for the next course

Update the README_header.md and agenda.md file for the next course. Also, update the docs/source/conf.py file for the gitlab-pages.

assigned to @k204045

enabled an automatic merge when the pipeline for 49952412 succeeds

aborted the automatic merge because source branch was updated

added 15 commits

• 49952412...75341030 - 14 commits from branch master
• 1c7e2bc2 - Merge branch 'master' into kmf

Compare with previous version

mentioned in commit 38865b3e

merged