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

tldr/pio-platform

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pio platform
+
+> Manage PlatformIO development platforms.
+> More information: <https://docs.platformio.org/en/latest/core/userguide/platforms/>.
+
+- List all installed development platforms:
+
+`pio platform list`
+
+- Search for existing development platforms:
+
+`pio platform search {{platform}}`
+
+- Show details about a development platform:
+
+`pio platform show {{platform}}`
+
+- Install a development platform:
+
+`pio platform install {{platform}}`
+
+- Update installed development platforms:
+
+`pio platform update`
+
+- Uninstall a development platform:
+
+`pio platform uninstall {{platform}}`
+
+- List all supported frameworks:
+
+`pio platform frameworks`