Astropy will no longer be installed by default

Until now Gnuastro and Astropy where installed by default in any clean
build of Maneage. Gnuastro is used to do the demonstration analysis that is
reported in the paper and Astropy was just there to help in testing the
building of the MANY tools it depends on! It (and its dependencies) also
had several papers that helped show software citation.

However, as Boud suggested in task #15619, the burden of installing them
for a new user may be too much and any future changes will cause merge
conflicts. It may also give the impression that Maneage is only/mainly
written for astronomers.

So with this commit, I am removing Astropy as a default target. But we can
only remove Gnuastro after we include an alternative analysis in the
demonstration `delete-me' files. Following Boud's suggestion in that task,
`TARGETS.conf' was also added to the files to be ignored in any future
merge (in the checklist of `README-hacking.mk'). The solution was already
described there, but mainly focused on the deleted `delete-me' files. So
with this commit, I brought out this item as a more prominent item in the
list. Maybe we can later add the analysis done in the Maneage paper (not
yet published).

In terms of testing the software builds, we already have task #15272
(Single target to build all high-level software, for testing) that aims to
have a single configure option to install ALL high-level software and we
can ask people to try if they like and report errors.

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