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

tldr/popd

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# popd
+
+> Remove a directory placed on the directory stack via the pushd shell built-in.
+> See also `pushd` to place a directory on the stack and `dirs` to display directory stack contents.
+> More information: <https://www.gnu.org/software/bash/manual/html_node/Directory-Stack-Builtins.html>.
+
+- Remove the top directory from the stack and cd to it:
+
+`popd`
+
+- Remove the Nth directory (starting from zero to the left from the list printed with `dirs`):
+
+`popd +N`
+
+- Remove the Nth directory (starting from zero to the right from the list printed with `dirs`):
+
+`popd -N`
+
+- Remove the 1st directory (starting from zero to the left from the list printed with `dirs`):
+
+`popd -n`