Begin of the insertion**As** an openproject developer
**I** want the timelines UI codeEnd of the insertion Begin of the deletion Timelines has grown beyond easily manageable file-size and needsEnd of the deletion to Begin of the insertiontoEnd of the insertion be Begin of the insertionwell structured
**so that** I can edit the code hassle-free.

**Acceptance criteria**

- The is no `timelines.js` that is longer than a couple of thousand lines.
- Timelines source files are separated by concerns andEnd of the insertion Begin of the deletion refactoredEnd of the deletion into Begin of the insertionseveral source files.
-End of the insertion Begin of the deletion smaller classes/files.End of the deletion The asset pipeline is Begin of the insertionutilizedEnd of the insertion Begin of the deletion still not usedEnd of the deletion for Begin of the deletion assembly ofEnd of the deletion the final Begin of the insertionjavascript creation.End of the insertion Begin of the deletion timeline.js, and should also be tackled.End of the deletion