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

tldr/pyenv

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pyenv
+
+> Switch between multiple versions of Python easily.
+> See also: `asdf`.
+> More information: <https://github.com/pyenv/pyenv>.
+
+- List all available commands:
+
+`pyenv commands`
+
+- List all Python versions under the `${PYENV_ROOT}/versions` directory:
+
+`pyenv versions`
+
+- List all Python versions that can be installed from upstream:
+
+`pyenv install --list`
+
+- Install a Python version under the `${PYENV_ROOT}/versions` directory:
+
+`pyenv install {{2.7.10}}`
+
+- Uninstall a Python version under the `${PYENV_ROOT}/versions` directory:
+
+`pyenv uninstall {{2.7.10}}`
+
+- Set Python version to be used globally in the current machine:
+
+`pyenv global {{2.7.10}}`
+
+- Set Python version to be used in the current directory and all directories below it:
+
+`pyenv local {{2.7.10}}`