Remove "Registers" from Day Plans

[hugo-codesfine]

Message by Daniel (CYF)
FYI https://github.com/CodeYourFuture/curriculum/blob/df08ba498598a986dae1a285932ccacd2425aa09/common-theme/layouts/_default/day-plan.html#L15-L35 is where the register is added to pages - if you remove that, registers will go away