syncthing: add page (#4215)

Co-authored-by: Zlatan Vasović <zlatanvasovic@gmail.com>

pages/common/syncthing.md

@@ -0,0 +1,32 @@
+# syncthing
+
+> Continuous bidirectional decentralised folder synchronisation tool.
+> More information: <https://docs.syncthing.net/>.
+
+- Start syncthing:
+
+`syncthing`
+
+- Print the device ID:
+
+`syncthing -device-id`
+
+- Change the home directory:
+
+`syncthing -home={{path/to/directory}}`
+
+- Force a full index exchange:
+
+`syncthing -reset-deltas`
+
+- Change the address upon which the web interface listens:
+
+`syncthing -gui-address={{ip_address:port|path/to/socket.sock}}`
+
+- Show filepaths to the files used by syncthing:
+
+`syncthing -paths`
+
+- Disable the syncthing monitor process:
+
+`syncthing -no-restart`