use a clean Makefile system to build/deploy site

This way, we get dependency/smart update for free. We don't need to
rebuild all the pages everytime a new one is added. The author, date of
creation and date of revision are extracted from git information. The
index is generated automatically, so adding a recipe is literally just
adding a markdown file in src/.

The deployment system uses rsync to push only newer data to the server.

There is a tag system that you can add at the end of each recipe file.
Tag pages are generated statically that contain all recipes with a given
tag.

It introduces more HTML template files, though.

To build website, type
make build

To deploy it,
make deploy

To clean everything,
make clean

data/style.css

@@ -0,0 +1,55 @@
+body {
+	max-width: 800px ;
+	margin: auto ;
+	padding: 0 16px ;
+	margin-bottom: 500px ;
+}
+
+h1 {
+	text-align: center ;
+}
+
+footer {
+	text-align: center ;
+}
+
+img {
+	max-width: 600px ;
+	width: 100% ;
+	margin: auto ;
+	display: block ;
+}
+
+code {
+	overflow-wrap: break-word ;
+	color: lime ;
+}
+
+li img {
+	max-width: 1em ;
+	max-height: 1em ;
+	display: inline ;
+}
+
+@media (prefers-color-scheme: dark) {
+	body {
+		background: #151515 ;
+		color: white ;
+	}
+	a {
+		color: lightblue ;
+	}
+	a:visited {
+		color: gray ;
+	}
+	h2 {
+		color: tomato ;
+	}
+}
+
+@media print {
+	a[href] {
+		text-decoration: none ;
+		color: black ;
+	}
+}