Delete outdated manual-installation-overview.md

Rationale:
- File has been outdated since 2018 (had "TODO: Review this file" for 7 years)
- Confused purpose: title says "Manual Installation" but subtitle says "summarizes what generator does"
- Outdated content: references /client directory, webpacker, missing auto-bundling
- No clear use case: rails generate react_on_rails:install IS the manual installation (not external CLI like create-react-app)
- Content is better covered in:
  - how-react-on-rails-works.md (architecture)
  - using-react-on-rails.md (usage)
  - Generator source code (what files are created)

Changes:
- Deleted docs/advanced-topics/manual-installation-overview.md
- Removed link in installation-into-an-existing-rails-app.md
- Updated ia-redesign-live.md tracker

Decision discussed with team in Slack. Can be reverted if use case is identified.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: ihabadham

docs/advanced-topics/manual-installation-overview.md

@@ -54,8 +54,6 @@
 
 ## Installation
 
-See the [Installation Overview](../advanced-topics/manual-installation-overview.md) for a concise set summary of what's in a React on Rails installation.
-
 ## NPM
 
 All JavaScript in React On Rails is loaded from npm: [react-on-rails](https://www.npmjs.com/package/react-on-rails). To manually install this (you did not use the generator), assuming you have a standard configuration, run this command (assuming you are in the directory where you have your `node_modules`):

docs/getting-started/installation-into-an-existing-rails-app.md

@@ -374,13 +374,19 @@ After Steps 1-8, found 12 files not in original plan. Investigated and reorganiz
    - No unique content lost
 
 6. **✅ Transformed `docs/getting-started.md` → `docs/getting-started/using-react-on-rails.md`**
+
    - Reduced from 253 to 238 lines (still comprehensive but focused)
    - Removed: Choose Starting Point (redundant), System Requirements (duplicate), More Reading (navigation)
    - Transformed installation section to conceptual overview with links
-   - Kept: Basic Usage, Auto-Bundling concept, Render-Functions concept, Error Handling
-   - Added: Clear "Next Steps" section with organized paths
-   - Purpose: Conceptual journey guide explaining how things work (not step-by-step tutorial)
-   - Updated link in quick-start.md
+
+7. **✅ Deleted `docs/advanced-topics/manual-installation-overview.md`**
+   - Outdated since 2018 (had "TODO: Review this file" for 7 years)
+   - Confused purpose: title said "Manual Installation" but subtitle said "summarizes what generator does"
+   - Outdated content: referenced `/client`, `webpacker`, missing auto-bundling
+   - No clear use case: generator IS the manual installation (not external CLI)
+   - Content better covered in: how-react-on-rails-works.md, using-react-on-rails.md
+   - Removed link from installation-into-an-existing-rails-app.md
+   - Decision discussed with team in Slack
    - Deleted original `docs/getting-started.md`
 
 **Remaining Entry Point Tasks:**
@@ -467,9 +473,8 @@ docs/
 │   ├── doctrine.md
 │   ├── style.md
 │   └── tips.md
-└── advanced-topics/ (2 files - KEEPING as category)
-    ├── rails-engine-integration.md            # Step 5 correction: from deployment
-    └── manual-installation-overview.md        # Orphaned: manual setup guide
+└── advanced-topics/ (1 file - KEEPING as category)
+    └── rails-engine-integration.md            # Step 5 correction: from deployment
 ```
 
 **Final Decisions:**