fix: preload editor feat: Utility class for markdown conversion

...va/unipotsdam/gf/core/management/utils/MarkdownUtils.java

...ain/java/unipotsdam/gf/modules/journal/model/Journal.java

...ipotsdam/gf/modules/journal/model/ProjectDescription.java

...tsdam/gf/modules/journal/service/DummyJournalService.java

...m/gf/modules/journal/service/DummyProjectDescription.java

...unipotsdam/gf/modules/journal/service/JournalService.java

...gf/modules/journal/service/ProjectDescriptionService.java

.../java/unipotsdam/gf/modules/journal/view/JournalView.java

...tsdam/gf/modules/journal/view/ProjectDescriptionView.java

gemeinsamforschen/src/main/webapp/assets/js/createJournal.js

gemeinsamforschen/src/main/webapp/assets/js/e-portfolio.js

...nsamforschen/src/main/webapp/assets/js/editDescription.js

gemeinsamforschen/src/main/webapp/pages/editDescription.jsp