Add the online sandbox, lossy conversion and @atlaskit/adf-schema evaluation

todo.md

@@ -150,8 +150,8 @@ The numbering is the order the work was planned in, not the order it ships.
       `htmlToMarkdown`. CommonMark spec suite runs against `markdownToHtml` from here (§10).
 - [ ] **8 — CLI.** A later goal, shaped around the personas once the library exists.
 - [ ] **9 — The online sandbox.** A web page with two textboxes converting back and forth between ADF and markdown, powered by the library's browser build.
-- [ ] **10 — Lossy conversion.** A direction that only converts what Markdown supports. Data from the ADF is preserved but format, design and other non-markdown constructs are dropped.
+- [ ] **10 — Lossy conversion.** A direction that only converts what Markdown actually supports, keeping the ADF's data while dropping what markdown cannot hold — format, design and the richer nodes.
-- [ ] **11 — Evaluate `@atlaskit/adf-schema`.** Determine whether `@atlaskit/adf-schema` should be added as a dev dependency to serve as truth for the ADF schema.
+- [ ] **11 — Evaluate `@atlaskit/adf-schema`.** Whether to add `@atlaskit/adf-schema` as a dev dependency to use as truth for the ADF schema.
 
 ## The ADF inventory to cover