Add initial Nextflow documentation in website

website/content/docs/interop/nextflow.md

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+---
+title: Nextflow
+menu:
+  main:
+    parent: Interop
+---
+
+# Nextflow
+
+[Nextflow](https://nextflow.io/) is a workflow engine with a [rich ecosystem]() of pipelines centered around biological analysis.
+
+> Nextflow enables scalable and reproducible scientific workflows using software containers. It allows the adaptation of pipelines written in the most common scripting languages.
+
+> Its fluent DSL simplifies the implementation and the deployment of complex parallel and reactive workflows on clouds and clusters. 
+
+Since Nextflow [includes support](https://www.nextflow.io/docs/latest/executor.html#ga4gh-tes) for the TES API, it can be used in conjunction with Funnel to run tasks or to interact with a common TES endpoint.  
+
+## Getting Started
+
+To set up Nextflow to use Funnel as the TES executor, run the following:
+
+```
+funnel server run
+```
+
+## Additional Resources
+
+- [Nextflow Homepage](https://nextflow.io/)
+
+- [Nextflow Documentation](https://www.nextflow.io/docs)
+
+- [Nextflow's TES Support](https://www.nextflow.io/docs/latest/executor.html#ga4gh-tes)
+
+- [nf-core](https://nf-co.re/)
+  > A community effort to collect a curated set of analysis pipelines built using Nextflow. 
+
+- [nf-canary](https://github.com/seqeralabs/nf-canary)
+  > A minimal Nextflow workflow for testing infrastructure.