add shell script for generating all pages, add source and dest dirs

gen.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+for file in site-src/*; do
+    bn=$(basename $file .src)
+    echo "Converting $bn..."
+    ./format $file site/$bn.html
+done

site-src/index.src

@@ -0,0 +1,3 @@
+* Index
+
+Welcome to {codex}.