Update 04-pipefilter.md to reflect current episode structure

[themkots]

Rearranged the Objectives of the episode to match the current discussion, in order of appearance.

Need some edits more to emphasize the UNIX filters 'philosophy', i.e. 'programs that do one thing, and do it well'.

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⏱️ Updated at 2024-04-12 08:20:36 +0000

[themkots]

As part of the Instructor Checkout process, I suppose this can be seen as a contribution.... Ta.

[bkmgit]

@themkots Thanks for the contribution. Feel free to make an additional pull request if last change can be improved upon.