JavaScript (v3): Rekognition, DDB - Remove unhelpful examples (#6817)

* JavaScript (v3): Rekognition - Delete Rekognition PPE app The rekognition PPE app is not much different from the photo analyzer cross service example. The only difference is the action used analyze the photos. The example also used outdated jquery versions, and needed heavy refactoring. There are no usages of this app in a dev guide so I'm removing it. * JavaScript (v3): DynamoDB - Remove item tracker cross service example The item tracker example was an express app showing basic usage of DynamoDB. It also had deprecated versions of jquery and needed heavy refactoring to be up to standard. Other examples cover the DynamoDB usage more thoroughly, and this example isn't being referenced anywhere. * JavaScript (v3): Rekognition - Remove video analyzer While we don't have other examples of analyzing video, it's a simple call that's covered by SDK reference docs. This example is using deprecated versions of jquery, is documented incorrectly, needs heavy refactoring, and is showcasing bad practices by doing so much processing on the client side. Deleting this for now as I believe it's anti-helpful to customers.

Author: cpyle0819

.doc_gen/cross-content/cross_DynamoDBDataTracker_JavaScript_block.xml

@@ -235,10 +235,6 @@ cross_DynamoDBDataTracker:
  - sdk_version: 3
  github: python/cross_service/dynamodb_item_tracker
  block_content: cross_DynamoDBDataTracker_Python_block.xml
- JavaScript:
- versions:
- - sdk_version: 3
- block_content: cross_DynamoDBDataTracker_JavaScript_block.xml
  service_main: dynamodb
  services:
  dynamodb:
@@ -475,10 +471,6 @@ cross_RekognitionPhotoAnalyzerPPE:
  versions:
  - sdk_version: 2
  block_content: cross_RekognitionLambdPPE_Java_block.xml
- JavaScript:
- versions:
- - sdk_version: 3
- block_content: cross_RekognitionPhotoAnalyzerPPE_JavaScript_block.xml
  service_main: rekognition
  services:
  rekognition:
@@ -531,13 +523,6 @@ cross_RekognitionVideoDetection:
  add_services:
  s3:
  ses:
- JavaScript:
- versions:
- - sdk_version: 3
- block_content: cross_RekognitionVideoAnalyzer_JavaScript_block.xml
- add_services:
- s3:
- ses:
  Python:
  versions:
  - sdk_version: 3