[JOSS] reduce superflous files?

[sappelhoff]

Removing your setup.cfg file would remove one file (less clutter in the top level of the repo) while not being too much of a drawback, because all that's specified is:

spectral_connectivity/setup.cfg

Lines 1 to 2 in d4ade18

	[aliases]
	test=pytest

if you really want that alias, you could also define a step like that in your Makefile

xref: openjournals/joss-reviews#4840

[edeno]

@sappelhoff I removed these files.