bug: Fix issue with page links going to the wrong place

pages.py

@@ -0,0 +1,17 @@
+
+import pathlib
+import re
+
+PAGE_RGX = r"page ([0-9]+)"
+
+# for root, dirs, files in pathlib.Path("./books/core").walk():
+for root, dirs, files in pathlib.Path("./books/natural-fantasy-atlas").walk():
+    files = [root / fn for fn in files if fn.endswith(".html")]
+    for fn in files:
+        with fn.open() as fh:
+            html = fh.read()
+        with fn.open('w') as fh:
+            for line in html.split("\n"):
+                if re.search(PAGE_RGX, line) and "</a" not in line:
+                    line = re.sub(PAGE_RGX, r'<a href="/books/natural-fantasy-atlas/#page-\1">\g<0></a>', line)
+                fh.write(line)