Improve undo/redo for Title component

As mentioned in https://github.com/CATcher-org/CATcher/pull/1164#issuecomment-1476047277, the undo / redo logic for the Title component is handled differently as it is done in blocks now.

Let's standardise the undo/redo logic for title & description.

Start by reading the discussion in pull request 1164, especially the referenced issue comment, and locate the Title component plus the existing block undo/redo logic. Compare how title and description changes are handled with blocks; the work is done when their undo/redo behavior follows the same standard.

Written by the indexing model from the issue text.