Clean up .gitignore

Meson enforces a separate build dir, so we no longer have to care
about build artifects in the source tree. Same applies for all
the generated crap autotools like to spread around.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2642>

.gitignore

@@ -1,82 +1,5 @@
-*.la
-*.lo
-*.o
-.deps
-.libs
-ABOUT-NLS
-ChangeLog
-INSTALL
-aclocal.m4
-autom4te.cache
 data/.osk-layout-workbench
-data/org.gnome.Shell.desktop
-data/org.gnome.Shell.desktop.in
-data/gnome-shell-extension-prefs.desktop
-data/gnome-shell-extension-prefs.desktop.in
-data/gnome-shell-theme.gresource
-data/gschemas.compiled
-data/perf-background.xml
-data/org.gnome.shell.gschema.xml
-data/org.gnome.shell.gschema.valid
-data/org.gnome.Shell.PortalHelper.desktop
-data/org.gnome.Shell.PortalHelper.service
-data/theme/.sass-cache
-data/theme/gnome-shell*.css.map
-data/theme/gnome-shell*.css
-docs/reference/*/*.args
-docs/reference/*/*.bak
-docs/reference/*/*.hierarchy
-docs/reference/*/*.interfaces
-docs/reference/*/*.prerequisites
-docs/reference/*/*.sgml
-docs/reference/*/*.signals
-docs/reference/*/*.stamp
-docs/reference/*/*.txt
-docs/reference/*/*.types
-docs/reference/*/html/
-docs/reference/*/xml/
-docs/reference/shell/doc-gen-*
-js/misc/config.js
-js/js-resources.c
-js/js-resources.h
-man/gnome-shell.1
-omf.make
-po/*.gmo
 po/gnome-shell.pot
-po/*.header
-po/*.sed
-po/*.sin
-po/.intltool-merge-cache
-po/Makevars.template
-po/POTFILES
-po/Rules-quot
-po/stamp-it
-scripts/launcher.pyc
-src/*.gir
-src/*.typelib
-src/*-enum-types.[ch]
-src/*-marshal.[ch]
-src/calendar-server/org.gnome.Shell.CalendarServer.service
-src/gnome-shell
-src/gnome-shell-calendar-server
-src/gnome-shell-extension-tool
-src/gnome-shell-hotplug-sniffer
-src/gnome-shell-perf-helper
-src/gnome-shell-perf-tool
-src/gnome-shell-portal-helper
-src/hotplug-sniffer/org.gnome.Shell.HotplugSniffer.service
-src/org-gtk-application.[ch]
-src/run-js-test
-src/test-recorder
-src/test-recorder.ogg
-src/test-theme
-src/st.h
-src/stamp-st.h
-src/stamp-st.h.tmp
-src/st-scroll-view-fade-generated.c
-src/stamp-st-scroll-view-fade-generated.c
-stamp-h1
-tests/run-test.sh
 *~
 *.patch
 *.sw?