docs: add CLI usage and integrate generation in release

www/docs/cli/filebrowser-completion-zsh.md

@@ -0,0 +1,52 @@
+# filebrowser completion zsh
+
+Generate the autocompletion script for zsh
+
+## Synopsis
+
+Generate the autocompletion script for the zsh shell.
+
+If shell completion is not already enabled in your environment you will need
+to enable it.  You can execute the following once:
+
+	echo "autoload -U compinit; compinit" >> ~/.zshrc
+
+To load completions in your current shell session:
+
+	source <(filebrowser completion zsh)
+
+To load completions for every new session, execute once:
+
+### Linux:
+
+	filebrowser completion zsh > "${fpath[1]}/_filebrowser"
+
+### macOS:
+
+	filebrowser completion zsh > $(brew --prefix)/share/zsh/site-functions/_filebrowser
+
+You will need to start a new shell for this setup to take effect.
+
+
+```
+filebrowser completion zsh [flags]
+```
+
+## Options
+
+```
+  -h, --help              help for zsh
+      --no-descriptions   disable completion descriptions
+```
+
+## Options inherited from parent commands
+
+```
+  -c, --config string     config file path
+  -d, --database string   database path (default "./filebrowser.db")
+```
+
+## See Also
+
+* [filebrowser completion](filebrowser-completion.md)	 - Generate the autocompletion script for the specified shell
+