nextflow: add page (#3265)

pages/linux/nextflow.md

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+# nextflow
+
+> Tool for running computational pipelines. Mostly used for bioinformatics workflows.
+> Homepage: <https://www.nextflow.io>.
+
+- Run a pipeline, use cached results from previous runs:
+
+`nextflow run {{main.nf}} -resume`
+
+- Run a specific release of a remote workflow from GitHub:
+
+`nextflow run {{user/repo}} -revision {{release_tag}}`
+
+- Run with a given work directory for intermediate files, save execution report:
+
+`nextflow run {{workflow}} -work-dir {{/path/to/directory}} -with-report {{report.html}}`
+
+- Show details of previous runs in current directory:
+
+`nextflow log`
+
+- Remove cache and intermediate files for a specific run:
+
+`nextflow clean -force {{run_name}}`
+
+- List all downloaded projects:
+
+`nextflow list`
+
+- Pull the latest version of a remote workflow from Bitbucket:
+
+`nextflow pull {{user/repo}} -hub bitbucket`
+
+- Update Nextflow:
+
+`nextflow self-update`