Resolve "Fix Bug in Frontend pipeline"

Related issues

The docker-build-angular-frontend pipeline step is executed in a subdirectory, but the Dockerfile is in the root directory. Remove the change directory (cd) entry in the pipeline step.

Closes #54 (closed)

Acceptance criteria

• Implemented code changes don't diverge from the related issue.
• Documentation reflects the status quo after merge.
• Only released versions of dependencies are used (i.e. no snapshot versions).
• Pipeline still works.
• GitLab issue is up-to-date.

If necessary, the following sections have been updated:

• Swagger
• Readme.md
• Documentation

Proposed squash commit message

Fix Bug in frontend pipeline

The docker-build-angular-frontend pipeline step is executed in a subdirectory, but the Dockerfile is in the root directory. Therefore, this commit removes the change directory (cd) entry in the pipeline step.

Closes #54 (closed)