switched to BEIS experimental postcode level gas & electricity use data to more easily aggregate to postcode sectors

re-ran EPC checks: fixed typos and cross-references; added pairs plot for comparisons; added recommendations for data cleaning/outlier removal; added/updated plot captions

update the carbon tax ffp

See merge request SERG/fridayFagPackets!2

2020 30 10 EPCs

See merge request SERG/fridayFagPackets!1

allows all html for tables (word version probably broken); added EPC notes; added total energy demand calcs & plots

added pages theme code to /docs on repo on git.soton otherwise the mirror to github over-writes it. NO CONTENT changed on github is preserved when we mirror OUT from git.soton