Add some control variables of makefile

Well... this should load the ~/.emacs.d/init.el which
will slow-down the compile-time but should work to enable
htmlize to do syntax highlight on source blocks.

The problem, however, seems that the theme is not working.
What I get for now is just a weird black/white syntax highlight.

There is this message as well on the end of the compilation:
Using schema /usr/share/emacs/25.3/etc/schema/xhtml.rnc

Author: ryukinix

Makefile

@@ -1,12 +1,15 @@
-ORG_FILES  := $(wildcard *.org)
-HTML_FILES := $(patsubst %.org, %.html, $(ORG_FILES))
+EMACS_INIT  := ~/.emacs.d/init.el
+EMACS_LOAD  := -l $(EMACS_INIT)
+EMACS_FLAGS := --batch --kill $(EMACS_LOAD)
+ORG_FILES   := $(wildcard *.org)
+HTML_FILES  := $(patsubst %.org, %.html, $(ORG_FILES))
 
 .PHONY: clean
 
 all: $(HTML_FILES)
 
 %.html: %.org
-	emacs $< --batch -f org-html-export-to-html --kill
+	emacs $< $(EMACS_FLAGS) -f org-html-export-to-html
 
 clean:
 	rm -rf *.html