Resolve "Draft: Repose | Incorporate various repose branches into one branch and merge into main" + Tags replacement

Closes #175 and #176

Unfortunately no separate branch for #176 was created. We deemed it too laborious to cherry-pick the changes apart, so this MR closes two (very related) issues at once:

1. Merge branches repose-export and Repose Study Fragen einfügen (Olena's version) & main. This includes setting up the REPOSE app configuration properly.
2. Update tags in REPOSE questionnaire according to Olena's instructions. I will close #176 manually after the merge.

Notes for reviewing

• Reminder: Serve with ng s @rcc/app -c=repose --ssl
• The purpose of this MR is only to merge the branches. We did not check the code itself since almost all TS files are reworked in dedicated branches anyway. We did fix linter errors though, which may entail some small changes to the program logic.
• repose-question-store.service.ts has over 4,000 changes and can be ignored. We checked it works as the questions show up on the questionnaire page. All the changes are either linting/styling or tags, which have been approved by the REPOSE team already.
• You may be getting a console error about missing questions. This is if you have journal entries from different/previous app versions. The REPOSE version includes only the REPOSE questionnaire, not the standard items. Just ignore the error or clear your browser data.