Rename to GNOME LaTeX: remove data/images/app/

The logo contains the text "LaTeXila".
The screenshots can be removed in 2018, it doesn't make a big difference
for just a few days.

configure.ac

@@ -178,7 +178,6 @@ AC_CONFIG_FILES([
 	data/icons/scalable/Makefile
 	data/icons/scalable/apps/Makefile
 	data/images/Makefile
-	data/images/app/Makefile
 	data/templates/Makefile
 	docs/Makefile
 	docs/reference/Makefile

data/images/Makefile.am

-SUBDIRS = app
-
 EXTRA_DIST =		\
 	arrows		\
 	delimiters	\

data/images/app/Makefile.am

-EXTRA_DIST = logo.svg
-
-appdir = $(pkgdatadir)/images/app
-dist_app_DATA = logo.png
-
-# The following screenshots were used for the AppData. They can be deleted in 2018.
-# screenshot-build-tools.png
-# screenshot-completion.png
-# screenshot-structure.png
-
--include $(top_srcdir)/git.mk