docs: add CLI usage and integrate generation in release

www/docs/cli/filebrowser-config-import.md

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+# filebrowser config import
+
+Import a configuration file
+
+## Synopsis
+
+Import a configuration file. This will replace all the existing
+configuration. Can be used with or without unexisting databases.
+
+If used with a nonexisting database, a key will be generated
+automatically. Otherwise the key will be kept the same as in the
+database.
+
+The path must be for a json or yaml file.
+
+```
+filebrowser config import <path> [flags]
+```
+
+## Options
+
+```
+  -h, --help   help for import
+```
+
+## Options inherited from parent commands
+
+```
+  -c, --config string     config file path
+  -d, --database string   database path (default "./filebrowser.db")
+```
+
+## See Also
+
+* [filebrowser config](filebrowser-config.md)	 - Configuration management utility
+