[DO NOT MERGE] GX 1.0 ToC proof of concept 4

[Rachel-Reverie]

ToC organized around common actions.

• Data Docs customization and use is consolidated under "Review results": fewer standalone top-level topics.
  • Would we want to also consolidate the "About" and "Try" topics under "Introduction to GX" at the top level?
• Longer procedures, geared more toward "how-to"
• The current pages with CRUD and method-focused examples would need to be reworked; possibly turned into "Learn" pages and linked to through the glossary, similar to the previous glossary's "in depth" pages.

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