Identify and update links to How the curriculum works module

[Dedekind561]

Acceptance criteria

• [ ] Identify all comms relevant to new volunteers (e.g. emails, presentations etc)
• [ ] Remove reference to old syllabus and link to new module on the curriculum website

Including presentations like this: https://docs.google.com/presentation/d/1B-fgMuZ3wSHFdCnzXrtF0qxvQc07QkcL3OJr0RGC4og/edit#slide=id.g17dc9a1f019_0_269

Owner

@Dedekind561

Stakeholder

@lilianabermudes @MarianaVazquezCYF

Approver

@CodeYourFuture/global-syllabus