improv(docs): add getting started sections

Author: dreamorosi

docs/utilities/batch.md renamed to docs/features/batch.md

@@ -0,0 +1,8 @@
+---
+title: Features
+description: Features of Powertools for AWS Lambda
+---
+
+<!-- markdownlint-disable MD043 -->
+
+Stuff

docs/core/event-handler/api-gateway.md renamed to docs/features/event-handler/api-gateway.md

@@ -56,7 +56,7 @@ These settings will be used across all logs emitted:
 ???+ info
     When `POWERTOOLS_DEV` environment variable is present and set to `"true"` or `"1"`, Logger will pretty-print log messages for easier readability. We recommend to use this setting only when debugging on local environments.
 
-See all environment variables in the [Environment variables](../index.md/#environment-variables) section.
+See all environment variables in the [Environment variables](../index.md#environment-variables) section.
 Check API docs to learn more about [Logger constructor options](https://docs.powertools.aws.dev/lambda/typescript/latest/api/types/_aws_lambda_powertools_logger.types.ConstructorOptions.html){target="_blank"}.
 
 #### Example using AWS Serverless Application Model (SAM)

docs/utilities/idempotency.md renamed to docs/features/idempotency.md

@@ -413,7 +413,7 @@ You can use the `awsSdkV3Client` parameter via any of the available [Provider Cl
 | [DynamoDBProvider](#dynamodbprovider)   | `new DynamoDBClient();`       |
 
 ???+ question "When is this useful?"
-	Injecting a custom AWS SDK v3 client allows you to [apply tracing](../core/tracer.md#patching-aws-sdk-clients) or make unit/snapshot testing easier, including SDK customizations.
+	Injecting a custom AWS SDK v3 client allows you to [apply tracing](../features/tracer.md#patching-aws-sdk-clients) or make unit/snapshot testing easier, including SDK customizations.
 
 === "SSMProvider"
 	```typescript hl_lines="5 7"