Update tags for multiple nodetool examples and remove Daily Digest.json

- Added relevant tags to the Color Boost Video, Email Classifier, Index PDFs, Paper2Podcast, and Summarize Newsletters examples for better categorization.
- Removed the Daily Digest example as it is no longer needed.

Author: georgi

src/nodetool/examples/nodetool-base/Color Boost Video.json

@@ -5,7 +5,10 @@
   "updated_at": "2025-05-19T06:50:36.746400",
   "name": "Color Boost Video",
   "description": "",
-  "tags": null,
+  "tags": [
+    "video",
+    "start"
+  ],
   "thumbnail": null,
   "thumbnail_url": null,
   "graph": {

src/nodetool/examples/nodetool-base/Daily Digest.json

@@ -5,7 +5,10 @@
   "updated_at": "2024-12-30T16:11:13.537102",
   "name": "Email Classifier",
   "description": "Automatically categorize emails using AI classification",
-  "tags": null,
+  "tags": [
+    "email",
+    "start"
+  ],
   "thumbnail": null,
   "thumbnail_url": null,
   "graph": {

src/nodetool/examples/nodetool-base/Email Classifier.json

@@ -5,7 +5,10 @@
   "updated_at": "2024-12-30T21:21:19.229323",
   "name": "Index PDFs",
   "description": "Create searchable vector database from PDF documents",
-  "tags": null,
+  "tags": [
+    "rag",
+    "start"
+  ],
   "thumbnail": null,
   "thumbnail_url": null,
   "graph": {

src/nodetool/examples/nodetool-base/Index PDFs.json

@@ -6,7 +6,7 @@
   "name": "Ingest PDF",
   "description": "",
   "tags": [
-    "llm"
+    "rag"
   ],
   "thumbnail": null,
   "thumbnail_url": null,

src/nodetool/examples/nodetool-base/Ingest PDF.json

@@ -5,7 +5,10 @@
   "updated_at": "2025-01-12T10:53:36.693315",
   "name": "Paper2Podcast",
   "description": "",
-  "tags": null,
+  "tags": [
+    "audio",
+    "start"
+  ],
   "thumbnail": null,
   "thumbnail_url": null,
   "graph": {

src/nodetool/examples/nodetool-base/Paper2Podcast.json

@@ -5,7 +5,10 @@
   "updated_at": "2025-01-12T01:20:42.665186",
   "name": "Summarize Newsletters",
   "description": "",
-  "tags": null,
+  "tags": [
+    "email",
+    "start"
+  ],
   "thumbnail": null,
   "thumbnail_url": null,
   "graph": {