Update elyra installation documentation (#2137)

Update root readme with instructions to install Elyra with
kfp-tekton by default e.g. the [all] option.

Fixes #2133

README.md

@@ -102,12 +102,24 @@ Elyra can be installed from PyPI:
 
 * [JupyterLab](https://github.com/jupyterlab/jupyterlab) 3.x is supported on **Elyra 2.0.0 and above**
 
-  Install from PyPI:
+  Install Elyra from PyPI ( Elyra >= 3.1.0 ):
+
+  ```bash
+  pip3 install --upgrade "elyra[all]>=3.1.0" && jupyter lab build
+  ```
+
+  Install fom Conda ( Elyra >= 3.1.0 ):
+  ```bash
+  conda install -c conda-forge "elyra[all]>=3.1.0" && jupyter lab build
+  ```
+
+  Install Elyra from PyPI ( Elyra < 3.1.0 ):
+
   ```bash
   pip3 install --upgrade "elyra>=2.0.1" && jupyter lab build
   ```
 
-  Install fom Conda:
+  Install fom Conda ( Elyra < 3.1.0 ):
   ```bash
   conda install -c conda-forge "elyra>=2.0.1" && jupyter lab build
   ```

docs/source/getting_started/installation.md

@@ -40,7 +40,7 @@ The instructions below are installing the latest release.
 If you use `pip`, install Elyra with:
 
 ```bash
-pip3 install --upgrade elyra && jupyter lab build
+pip3 install --upgrade elyra[all] && jupyter lab build
 ```
 
 If desired, you can install these Elyra extensions independently:
@@ -74,7 +74,7 @@ If desired, you can install these Elyra extensions independently:
 If you use `conda`, install Elyra with:
 
 ```bash
-conda install -c conda-forge elyra && jupyter lab build
+conda install -c conda-forge elyra[all] && jupyter lab build
 ```
 
 or install the Pipeline editor, Code Snippet, or Script editor extensions individually:

etc/docker/README.md

@@ -25,7 +25,7 @@ Builds the Elyra image for use as standalone or with JupyterHub. See [Deploying
 Elyra on OpenShift is available via Open Data Hub. Elyra Image is available via [quay.io](https://quay.io/repository/thoth-station/s2i-lab-elyra?tab=tags) and supporting image build files via [s2i-lab-elyra](https://github.com/opendatahub-io/s2i-lab-elyra)
 
 ### kubeflow (Open Data Hub)
-Build the Elyra image for use with Kubeflow's Notebook Server.  See [Using Elyra with the Kubeflow Notebook Server](https://elyra.readthedocs.io/en/latest/recipes/using-elyra-with-kubeflow-notebook-server.html)
+Build the Elyra image for use with Kubeflow's Notebook Server. This image includes all kfp dependencies (i.e. kfp, kfp-tekton). See [Using Elyra with the Kubeflow Notebook Server](https://elyra.readthedocs.io/en/latest/recipes/using-elyra-with-kubeflow-notebook-server.html)
 
 ### tensorflow
 Builds custom tensorflow v1.15.2 runtime images for use with Elyra, one with GPU libraries and support and one without.