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Docs: Make the example more obviously an example (#80)
In a recent support ticket, a user had copied the example `:repo:` line into their `Aptfile`, which previously referred to the now obsolete "artful" Ubuntu LTS release. This caused the build to fail after #79, when previously the error was ignored. This PR makes the example more clearly just an example, and emphasises that using a custom repository is only necessary if using packages from outside the standard Ubuntu repository. In addition, the bogus `pg` Gem example was removed, since `libpq-dev` is part of the stack image, so we should not be encouraging people to install it unnecessarily.
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