pushd: add page

pages/common/popd.md

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+# Popd
+
+> Removes a directory placed on the directory stack via the pushd shell built-in.
+
+- Remove the top directory from the stack and cd to it:
+
+`popd`
+
+- Removes the Nth directory (starting from zero to the left from the list printed with dirs):
+
+`popd +N`
+
+- Removes the Nth directory (starting from zero to the right from the list printed with dirs):
+
+`popd -N`
+