refactor: Replace deprecated dungeon editor guide with updated documentation

- Deleted the old D1-dungeon-editor-guide.md and F1-dungeon-editor-guide.md files to streamline documentation.
- Introduced a new DUNGEON_EDITOR_GUIDE.md that consolidates features, architecture, and usage instructions for the Dungeon Editor.
- Updated the development guide to include new naming conventions and clarified rendering processes.
- Enhanced the overall structure and content of the documentation to reflect the current production-ready status of the Dungeon Editor.

docs/E2-development-guide.md

@@ -168,3 +168,9 @@ Default palettes are applied during ROM loading based on sheet index:
 - Sheets 0-112: Dungeon main palettes
 - Sheets 113-127: Sprite palettes
 - Sheets 128-222: HUD/menu palettes
+
+### Naming Conventions
+- Load: Reading data from ROM into memory
+- Render: Processing graphics data into bitmaps/textures (CPU pixel operations)
+- Draw: Displaying textures/shapes on canvas via ImGui (GPU rendering)
+- Update: UI state changes, property updates, input handling