chore: disable legacy workflows superseded by optimized CI configurations

- Commented out `push` triggers in `test-site-builds-legacy`, `test-site-builds`, `ci-preview`, and `ci-preview-legacy` workflows.
- Added notes linking to the respective new workflows (`nx-optimized-ci.yml`, `nx-smart-deploy.yml`).

Author: jonphipps

.github/workflows/ci-preview-legacy.yml

@@ -1,7 +1,8 @@
 name: build-preview
 on: 
-  push:
-    branches: [main]
+  # Disabled - legacy workflow superseded by nx-smart-deploy.yml
+  # push:
+  #   branches: [main]
   pull_request:
     branches: [main]
   workflow_dispatch:

.github/workflows/ci-preview.yml

@@ -1,7 +1,8 @@
 name: build-preview
 on: 
-  push:
-    branches: [main]
+  # Disabled - superseded by nx-smart-deploy.yml
+  # push:
+  #   branches: [main]
   pull_request:
     branches: [main]
   workflow_dispatch:

.github/workflows/test-site-builds-legacy.yml

@@ -1,8 +1,9 @@
 name: Test Site Builds
 
 on:
-  push:
-    branches: [main, dev]
+  # Disabled - legacy workflow superseded by nx-optimized-ci.yml
+  # push:
+  #   branches: [main, dev]
     paths:
       - 'packages/**'
       - 'standards/**'

.github/workflows/test-site-builds.yml

@@ -1,17 +1,18 @@
 name: Test Site Builds
 
 on:
-  push:
-    branches: [main, dev]
-    paths:
-      - 'packages/**'
-      - 'standards/**'
-      - 'portal/**'
-      - 'scripts/**'
-      - '.github/workflows/**'
-      - 'package.json'
-      - 'pnpm-lock.yaml'
-      - 'tsconfig.json'
+  # Disabled - superseded by nx-optimized-ci.yml
+  # push:
+  #   branches: [main, dev]
+  #   paths:
+  #     - 'packages/**'
+  #     - 'standards/**'
+  #     - 'portal/**'
+  #     - 'scripts/**'
+  #     - '.github/workflows/**'
+  #     - 'package.json'
+  #     - 'pnpm-lock.yaml'
+  #     - 'tsconfig.json'
   pull_request:
     branches: [main, dev]
   workflow_dispatch: