README-hacking.md: edits and corrections for easier customization

The checklist descriptions were slightly edited to be more clear. Also,
while following them, I noticed that while removing the "delete-me" parts
on `verify.mk', would cause an error: the `if [ $$m == delete-me ];'
statement we were saying to delete cause an error because `elif' was the
first statement Bash would see. So with this commit, the `download'
conditional (which isn't instructed to be deleted) was set to be the top
(with an `if') and the `delete-me' conditional now has an `elif'.

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