Redesigned and rewrote the website

Moved most pages out of the index.cgi and into a POD file while I was at
it.

dat/ncdu-scr

@@ -0,0 +1,29 @@
+=pod
+
+Note: While these screenshots are from version 1.7, the latest version has only
+little visible changes.  Let me also apologise for the crappy formatting, I
+should take some smaller shots next time...
+
+=head2 Scanning...
+
+[img scr ncduscan.png Ncdu scanning a large directory.]
+
+=head2 Done scanning
+
+[img scr ncdudone.png Ncdu done scanning a large directory.]
+
+=head2 Directory information
+
+[img scr ncduinfo.png Ncdu displaying directory information.]
+
+=head2 Delete confirmation
+
+[img scr ncduconfirm.png Ncdu asking for confirmation to delete a file.]
+
+=head2 Help screen
+
+[img scr ncduhelp1.png Ncdu help screen.]
+
+=head2 About screen
+
+[img scr ncduhelp2.png Ncdu about screen.]