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

tldr/zcat

@@ -0,0 +1,17 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# zcat
+
+> Print data from `gzip` compressed files.
+> More information: <https://www.gnu.org/software/gzip/manual/gzip.html>.
+
+- Print the uncompressed contents of a `gzip` archive to `stdout`:
+
+`zcat {{file.txt.gz}}`
+
+- Print compression details of a `gzip` archive to `stdout`:
+
+`zcat -l {{file.txt.gz}}`