1. library/rich-text-editor: [NEW] Common component which configures a rich text editor.
2. dataset-editor.component.html & main-info.component.html: Use <rich-text-editor-component> to allow rich text in dataset and dmp description.
3. dataset-overview.component.html & dmp-overview.component.html: Show dataset and dmp description as innerHTML.
4. dataset.module.ts & dmp.module.ts: Imported RichTextEditorModule.