dropuser: add page

pages/common/dropuser.md

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+# dropuser
+
+> Remove an existing PostgreSQL user (role).
+> More information: <https://www.postgresql.org/docs/current/app-dropuser.html>.
+
+- Prompt for confirmation and the username before user removal:
+
+`dropuser {{[-i|--interactive]}}`
+
+- Remove user instantly:
+
+`dropuser {{username}}`
+
+- No error if the user to be removed doesn't exist:
+
+`dropuser --if-exists {{username}}`
+
+- Remove a user on the server with address 127.0.0.1 on port 4321:
+
+`dropuser {{[-h|--host]}} 127.0.0.1 {{[-p|--port]}} 4321 {{username}}`
+
+- Remove a user on the server with address 127.0.0.1 on port 4321 as user "admin" :
+
+`dropuser {{[-U|--username]}} admin {{[-h|--host]}} 127.0.0.1 {{[-p|--port]}} 4321 {{username}}`