Merge relevant changes form branch gitlab_ci_setup_production to enable gitlab ci pipeline

GitLab CI pipeline is now ready to be merged into branch master. There are three jobs for building Jekyll pages, creating GitLab pages (since the page is not yet online) and triggering team-map project. The last job is commented out for later usage.

added 19 commits

• 3a15e038 - 1 commit from branch master
• 5220b257 - created gitlab ci yaml file.
• fa81d260 - wrong syntax in gitlab ci yml file.
• a91f1726 - added gitlab ci job to run jekyll build with latest dependencies.
• 184018ae - no need for artifacts in jekyll build with latest dependencies.
• fe36c8f4 - run ci pipeline job only if triggered by schedule rule.
• 03ab4fb6 - need to move befor_script of pipeline jobs in gitlab ci yaml file.
• ef01f9d2 - Removed only key in gitlab ci job for latest dependencies
• b41297b0 - Added extensions to gitlab ci yaml file
• f06dc438 - Renamed environment variables
• c48afd13 - Remove Gemfile.lock file in branches for latest dendencies
• a5d33cfc - Wrong syntax in gitlab ci yaml file
• 82c1c7ba - Use different notation or bash if-condition for readability
• 1c9b26a3 - Gitlab ci yaml file sometimes need douple-quoted commands
• ffa6f828 - Linting gitlab ci yaml file
• d8f44ed6 - Enter some data to team yaml file
• 24377cf1 - Use latest ruby docker container for gitlab ci yaml file
• 46a82d1c - Remove team_map job from gitlab ci yaml file
• 2612ae61 - Only latest dependecies job should be based on ruby:latest

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resolved all threads

added 1 commit

• 9727a402 - Apply suggestion to .gitlab-ci.yml

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added 1 commit

• 629414ff - Exchanged branch in only section.

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merged