feat(scripts): added the wordcount script

This script gets statistics for the book.

scripts/wordcount.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+#
+# wordcount
+#
+# Given a set of markdown files, counts the words, approximates
+# the pages and summarises. Outputs in CSV.
+#
+# Example:
+#   ./scripts/wordcount.sh ./website/content/docs/section*/**/_index.md > statistics.csv
+
+# Write out the CSV column titles.
+echo -e '"Path","Section","Title","Wordcount","Pagecount"'
+
+# Go through each file we'll get statistics for.
+for file in $@; do
+    # Get the section from the folder structure - perhaps better to put it in
+    # the frontmatter in the future?
+    section=$(basename $(dirname $(dirname "$file")))
+
+    # Rip out the title from the frontmatter.
+    title=$(cat $file |\
+        grep 'title: ' |\
+        sed -E 's/.*title:[[:space:]]*["]?([^"]*)["]?$/\1/')
+
+    # Get the wordcount.
+    wc=$(wc -w < "$file" | tr -d ' ')
+
+    # Get the pagecount.
+    pc=$(( (wc/500) + 1 ))
+
+    # Write the results as a line of CSV.
+    echo -e "\"$file\",\"$section\",\"$title\",\"$wc\",\"$pc\""
+
+done