darcs, friendly version control

#3Reorder Sections in Chapter 3 to Ensure Correct Workflow

In Chapter 3 of the Darcs book, the "Removing a file" section currently appears too early, before the reader has completed certain exercises. Specifically, this sequence causes an issue because the test file Main.hs is deleted in the "Removing a file" section, preventing further exercises that require this file.

To ensure that the exercises can be completed in the correct order, it would be advisable to move the "Removing a file" section to a later point in the chapter. This adjustment will prevent any disruption in the flow of the tutorial.