Update Deliverables text on Core Lessons page

[stefaniebutland]

Deliverables

Revisit Deliverables heading and content in light of current approach

• [x] delete What would you do in a Study Group?
  • links under heading are old or broken; best to delete this section and focus on Seaside Chats + Coworking between Cohort Calls
• [x] replace Assignments with Coworking description?
• [x] Revisit Additional reading on Core Lessons page -> good links but better elsewhere? Here share the links we send in Welcome email to a cohort

broken link issue https://github.com/Openscapes/series/issues/47 may be resolved by this issue

[jules32]

Thanks for starting this issue Stef; I completed all tasks, and moved Additional Reading to Inspiration section (for now)

[jules32]

Started https://github.com/Openscapes/series/pull/53