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

tldr/dune

@@ -0,0 +1,25 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# dune
+
+> A build system for OCaml programs.
+> More information: <https://dune.build>.
+
+- Build all targets:
+
+`dune build`
+
+- Clean up the workspace:
+
+`dune clean`
+
+- Run all tests:
+
+`dune runtest`
+
+- Start the utop REPL with compiled modules automatically loaded into it, to remove the need to load them by hand:
+
+`dune utop`