gpg-card: add page (#11685)

pages/common/gpg-card.md

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+# gpg-card
+
+> Administrate OpenPGP and PIV smart cards.
+> Similar to `gpg --card-edit`.
+> More information: <https://manned.org/gpg-card>.
+
+- Start in interactive mode:
+
+`gpg-card`
+
+- Invoke one or more commands non-interactively:
+
+`gpg-card {{command1}} -- {{command2}} -- {{command3}}`
+
+- Show information about a smart card:
+
+`gpg-card list`
+
+- Retrieve the public key using the URL stored on an OpenPGP card:
+
+`gpg-card fetch`
+
+- Set the URL used by the `fetch` command:
+
+`gpg-card url`
+
+- Change or unblock PINs (uses the default action for the card in non-interactive mode):
+
+`gpg-card passwd`
+
+- Toggle the forcesig flag of an OpenPGP card (i.e. require entering the user PIN for signing):
+
+`gpg-card forcesig`
+
+- Factory reset a smart card (i.e. delete all data and reset PINs):
+
+`gpg-card factory-reset`