Add doc for hypernode-vedit

docs/hypernode-platform/varnish/editing-varnish-vcl-with-hypernode-vedit.md

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+---
+myst:
+  html_meta:
+    description: Learn how to easily edit your Varnish VCL with hypernode-vedit.
+    title: Editing Varnish VCL with hypernode-vedit
+---
+
+# Editing Varnish VCL with hypernode-vedit
+
+While we generally advise developers to make changes to the Varnish VCL in a persistent way (like `/data/web/app.vcl`), there are cases where you might want to make temporary changes directly to the active VCL. For example, when testing a change or debugging an issue.
+
+The `hypernode-vedit` CLI tool allows you to edit the active Varnish VCL on your Hypernode. The command will store the active VCL in a temporary file, open it in the default editor, and then reload the edited VCL back into Varnish when you save and exit.
+
+```console
+app@example-magweb-cmbl ~ $ hypernode-vedit
+Checking VCL syntax...
+Syntax OK.
+Apply this VCL now? [y/N] y
+VCL loaded and activated as 'vcl_1780641679'.
+```
+
+In this example, you of course don't see the actual editing process, but after you save and exit the editor, the new VCL is loaded and activated in Varnish.