Replace 'Read on' subheading with 'Steps in this phase'

[ElenaFdR]

The 'Read on' H2, when highlighted in the right nav, is confusing. Separately, adding an overview of steps in a phase is desirable, so these can be combined.

To do this, all of the 'read on' content will need to be reworked. Phases without read may need to have content deduped once the 'steps in this phase' section is added.