docs: add CLI usage and integrate generation in release

www/docs/cli/filebrowser-completion.md

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+# filebrowser completion
+
+Generate the autocompletion script for the specified shell
+
+## Synopsis
+
+Generate the autocompletion script for filebrowser for the specified shell.
+See each sub-command's help for details on how to use the generated script.
+
+
+## Options
+
+```
+  -h, --help   help for completion
+```
+
+## Options inherited from parent commands
+
+```
+  -c, --config string     config file path
+  -d, --database string   database path (default "./filebrowser.db")
+```
+
+## See Also
+
+* [filebrowser](filebrowser.md)	 - A stylish web-based file browser
+* [filebrowser completion bash](filebrowser-completion-bash.md)	 - Generate the autocompletion script for bash
+* [filebrowser completion fish](filebrowser-completion-fish.md)	 - Generate the autocompletion script for fish
+* [filebrowser completion powershell](filebrowser-completion-powershell.md)	 - Generate the autocompletion script for powershell
+* [filebrowser completion zsh](filebrowser-completion-zsh.md)	 - Generate the autocompletion script for zsh
+