Create generic pipelines tutorial for JupyterLab (#54)

Updates:
- Requires Elyra >= 3.0 (and thus pipeline version 4) 
- Introduces new terminology: generic pipeline, generic component
- Refreshes content based on 3.0 features
- Removes legacy pipeline tutorials

Author: ptitzler

README.md

@@ -19,20 +19,21 @@ limitations under the License.
 # Elyra examples
 
 This repository provides a set of examples that explore some of the unique
-features provided by Elyra. All examples require Elyra version 2.3.x.
+features provided by Elyra. All examples require Elyra version 3.x.
 
 Examples for earlier releases:
  - [`v2.2.x`](https://github.com/elyra-ai/examples/tree/v2.2.x)
 
-## AI/ML Pipelines
+## Pipelines
 
-Use the Elyra Visual Pipeline Editor to [assemble pipelines from Python notebooks or scripts](https://elyra.readthedocs.io/en/latest/user_guide/pipelines.html) without the need for any coding.
+Use the Elyra Visual Pipeline Editor to [assemble pipelines from Python notebooks or scripts](https://elyra.readthedocs.io/en/stable/user_guide/pipelines.html) without the need for any coding.
 
-### Pipelines tutorials
-Tutorials to get started with pipelines in Elyra:
-- [Running pipelines in a local environment](pipelines/hello_world)
-- [Running pipelines on Kubeflow Pipelines](pipelines/hello_world_kubeflow_pipelines)
-- [Running pipelines on Apache Airflow](pipelines/hello_world_apache_airflow)
+### Pipeline tutorials
+
+Tutorials to get started with generic pipelines in Elyra:
+- [Introduction to generic pipelines](pipelines/introduction-to-generic-pipelines)
+- [Run generic pipelines on Kubeflow Pipelines](pipelines/run-generic-pipelines-on-kubeflow-pipelines)
+- [Run generic pipelines on Apache Airflow](pipelines/run-generic-pipelines-on-apache-airflow)
 
 ### Example pipelines
 This repository includes the following example pipelines: