Address #491 - Selecting a Nextflow version and Environment variables (#627)

* Address #491 - Selecting a Nextflow version and Environment variables

* removing Environment section

* Prettify orientation file

---------

Co-authored-by: Marcel Ribeiro-Dantas <[email protected]>

Author: KristinaGagalova

docs/basic_training/orientation.md

@@ -63,6 +63,12 @@ If you want to use a specific version of Nextflow, you can set the `NXF_VER` var
 export NXF_VER=23.10.1
 ```
 
+You can double-check `NXF_VER` by running:
+
+```bash
+nextflow -version
+```
+
 !!! question "Exercise"
 
     Open the GitHub Codespaces training environment and use the following command to switch to the `nf-customize` folder. View the files in this folder using the `tree` command:
@@ -71,23 +77,3 @@ export NXF_VER=23.10.1
     cd /workspaces/training/nf-training
     tree .
     ```
-
-## Environment variables
-
-By default, Nextflow will pull the latest stable version into your environment.
-
-However, Nextflow is constantly evolving as improvements are made.
-
-The [latest releases](https://github.com/nextflow-io/nextflow/releases) can be viewed on GitHub.
-
-If you want to use a specific version of Nextflow, you can set the `NXF_VER` variable:
-
-```bash
-export NXF_VER=23.10.1
-```
-
-!!! note
-
-    This tutorial workshop requires `NXF_VER=23.10.1`, or later.
-
-If you have exported the `NXF_VER` variable, execute `nextflow -version` again to confirm that the change has taken effect.