don't hardcode /usr/share paths

Add a defines.mk file defining the standard default layout
for installation (PREFIX, DATAROOTDIR, LIBDIR etc.).

Add a $(JSDIR) variable and use env!("JSDIR") in place of
the hardcoded /usr/share/javascript/proxmox-backup path.

Have defines.mk include an *optional* local.mak to override
JSDIR to www/ during local development.

Add `make install` targets and remove debian/install.

Note that service files are now in $libdir/proxmox-backup/
as there's usually no point in starting them from the
command line, so /usr/sbin makes no sense.

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>

www/Makefile

@@ -1,3 +1,9 @@
+include ../defines.mk
+
+IMAGES := \
+	images/logo-128.png \
+	images/proxmox_logo.png
+
 JSSRC=							\
 	Utils.js					\
 	Logo.js						\
@@ -24,3 +30,11 @@ js/proxmox-backup-gui.js: js OnlineHelpInfo.js ${JSSRC}
 clean:
 	find . -name '*~' -exec rm {} ';'	
 	rm -rf js
+
+install: js/proxmox-backup-gui.js
+	install -dm755 $(DESTDIR)$(JSDIR)
+	install -dm755 $(DESTDIR)$(JSDIR)/js
+	install -m644 js/proxmox-backup-gui.js $(DESTDIR)$(JSDIR)/js/
+	install -dm755 $(DESTDIR)$(JSDIR)/images
+	$(foreach i,$(IMAGES), \
+	    install -m644 $(i) $(DESTDIR)$(JSDIR)/images/ ;)