Add Makefile and use GNU parallel in compress.sh

Makefile

@@ -0,0 +1,8 @@
+all: public
+
+clean:
+	rm -rf public/
+
+public:
+	hugo
+	./compress.sh

compress.sh

@@ -2,17 +2,18 @@
 
 files=$(find public/ -name "*.html" -o -name "*.xml" -o -name "*.css" -o -name "*.js")
 
-for f in $files; do
-    ( gzip -fnk "$f" && echo "GZIP $f" ) &
-done
+gz() {
+    echo "GZIP $1"
+    gzip -fnk $1
+}
 
-wait
-echo "gzip done, starting brotli"
+br() {
+    echo "BROTLI $1"
+    brotli -fZk $1
+}
 
+export -f gz
+export -f br
 
-for f in $files; do
-    ( brotli -fZk "$f" && echo "BROTLI $f" ) &
-done
-
-wait
-echo "broli done"
+parallel $@ gz {} <<< $files
+parallel $@ br {} <<< $files