README-hacking.md: script to list installed programs before configure

Until now, the small one-line script that lists programs was introduced in
the checklist after running `./project configure'. But people would mostly
miss it because they would wait until the configuration is complete.

With this commit, that point has been put above the `./project configure'
step. Readers are instructed to open a new terminal and run that script,
then go to the next step so they see the directories get filled
actively. It will also help them understand what is going on.

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