Iteration plan: break down approach to preserving unchanged Markdown

Goal

The effort to preserve unchanged Markdown will take multiple milestones to complete but may be possible to work on in parallel. The goal of this issue is to identify an iteration plan and break down the main deliverable into smaller issues.

Deliverable

Epics and issues created and assigned an initial weight for planning, with &7256 as the parent epic.

https://docs.google.com/document/d/1nB5kFh2jFgz-okyUN9h2yN9W1mwqGohLpE33afQVf7Y/edit#heading=h.t8grn4i80jkj

Edited by Eric Schurter