I've removed the 'extends' blocks and built a completely seperated template from
the rest of the website. The template was not rendering properly because certain
parts of the website had not been set-up yet so the complete isolated template
was/is required.
I've, also, added extra options for the user to set during this first run
process which will be processed by the back-end. I've not put much work into
adding validation checks because it is a one-time thing (this page). You'll need
access to the server anyway -- at this point -- so a bit of manual correction of
mistakes will be easy to achieve. Deleting the database will be enough to
trigger the first run process again.