Move pages under tldr, lint run.sh, update docs

tldr/syncthing

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# syncthing
+
+> Continuous bidirectional decentralised folder synchronisation tool.
+> More information: <https://docs.syncthing.net/>.
+
+- Start Syncthing:
+
+`syncthing`
+
+- Start Syncthing without opening a web browser:
+
+`syncthing -no-browser`
+
+- 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`