Revert "Fix energy-grants-calculator interpolation error"

This reverts commit 3dbbd7bb2d060c259826669a60de4afd62a83040.
Revert "Update energy_grants_calculator logic and content"

This reverts commit 92ac6f5e1ded79daf95424c69488f6d1d9db790d.
Revert "Update energy_grants_calculator further progress"

This reverts commit f21d86b263da8efe360b2cc6dc711ff594e6c35e.
Revert "Update energy_grants_calculator work in progress"

This reverts commit bcbb3dab89c3505709d54307cbe53301a00e6767.
Merge pull request #749 from alphagov/revert_energy_grants_copy_changes

Revert energy grants copy changes