Remove references to Jupyterlab 1.x and 2.x from documentation (#3112)

Signed-off-by: Alan Chin <akchin@us.ibm.com>
Co-authored-by: Alan Chin <akchin@us.ibm.com>

README.md

@@ -150,22 +150,6 @@ Installation instructions and JupyterLab support vary by release. Note that a Ju
     ```
 </details>
 
-<details>
-  <summary>Elyra 1.0 < 2.0 (JupyterLab 2.x)</summary>
-
-  - Install from PyPI
-
-    ```bash
-    pip3 install --upgrade "elyra<2.0.0" && jupyter lab build
-    ```
-
-  - Install from conda-forge
-
-    ```bash
-    conda install -c conda-forge "elyra<2.0.0" && jupyter lab build
-    ```
-</details>
-
 ### Verify Installation 
 
 Run the following commands to verify the installation. Note that in the example output below the `[version]` placeholder is displayed instead of an actual version identifier, which might change with every release.

SECURITY.md

@@ -3,8 +3,10 @@
 ## Supported Versions
 
 | Version | Supported          |
-| ------- | ------------------ |
-| 3.x   | :white_check_mark: |
+|---------|--------------------|
+| 1.x     | :x:   EOL          |
+| 2.x     | :x:   EOL          |
+| 3.x     | :white_check_mark: |
 
 ## Reporting a Vulnerability
 

docs/source/developer_guide/development-workflow.md

@@ -150,8 +150,8 @@ The `clean-jupyterlab` removes your JupyterLab packages and completely deletes y
 Make sure to backup any important data in your environment before running the script.
 To clean your environment and install the latest JupyterLab:
 `etc/scripts/clean-jupyterlab.sh`
-To specify a JupyterLab version to be installed:
-`etc/scripts/clean-jupyterlab.sh --version 2.2.9`
+To specify a JupyterLab version `x.y.z` to be installed:
+`etc/scripts/clean-jupyterlab.sh --version x.y.z`
 
 #### Parallel Development with @elyra/pipeline-editor
 

docs/source/getting_started/installation.md

@@ -26,8 +26,6 @@ The Elyra [JupyterLab extensions](https://jupyterlab.readthedocs.io/en/stable/us
 
 JupyterLab dependencies:
  - Elyra >= 2.0.0 requires JupyterLab 3.x
- - Elyra < 2.0.0 requires JupyterLab 2.x
- - Elyra == 0.10.x requires JupyterLab 1.x
 
 The instructions below are installing the latest release.