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

tldr/doxygen

@@ -0,0 +1,21 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# doxygen
+
+> A documentation system for various programming languages.
+> More information: <http://www.doxygen.nl>.
+
+- Generate a default template configuration file `Doxyfile`:
+
+`doxygen -g`
+
+- Generate a template configuration file:
+
+`doxygen -g {{path/to/config_file}}`
+
+- Generate documentation using an existing configuration file:
+
+`doxygen {{path/to/config_file}}`