tutorials: improve theme + use pandoc 2

tutorial/pandoc-opts.mk

@@ -0,0 +1,16 @@
+PANDOCOPTS	= --pdf-engine=xelatex \
+		  --standalone \
+		  --number-sections \
+		  --toc \
+		  -f markdown+smart \
+		  -M fontsize=12pt \
+		  -M papersize=a4paper \
+		  -M mainfont="Linux Libertine O" \
+		  -M monofont="FantasqueSansMono-Regular" \
+		  -M sansfont="Linux Biolinum O" \
+		  -M colorlinks=true \
+		  -M linkcolor="black" \
+		  -M urlcolor="ForestGreen" \
+		  -M indent=true \
+		  -V toc-title="Sommaire" \
+		  --include-in-header=../header.tex