• main page should have a small section for each section in the sidebar: Getting Started, Core, Tools, Networks, Apps, Research
• you should be able to link directly to one of these sections, rather than "the first subsection within them" this would make sense only if each section had a readme and its own landing, which is overkill
• Include Spec in Sidebar (orig issue: docs: add specification to docs side bar #2348)

Getting Started

• first subsection is called Tendermint. Should be called Quick Start and link places to find more advanced starts!

Using Tendermint

• we should reconcile the structure of this section with the larger "Tendermint Core" section:
  protocol stuff can probably in a separate Specification section
• add more info about Upgrading to new versions (e.g., Can't run tendermint node (version 0.24.0) #2390)

original issue: #2143