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

tldr/readlink

@@ -0,0 +1,17 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# readlink
+
+> Follow symlinks and get symlink information.
+> More information: <https://www.gnu.org/software/coreutils/readlink>.
+
+- Get the actual file to which the symlink points:
+
+`readlink {{path/to/file}}`
+
+- Get the absolute path to a file:
+
+`readlink -f {{path/to/file}}`