wormhole: add page (#3866)

pages/common/wormhole.md

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+# wormhole
+
+> Get things from one computer to another, safely.
+> More information: <https://magic-wormhole.readthedocs.io/en/latest/>.
+
+- Send a file:
+
+`wormhole send {{path/to/file}}`
+
+- Receive a file:
+
+`wormhole receive {{wormhole_code}}`
+
+- Send raw text:
+
+`wormhole send`