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

tldr/optipng

@@ -0,0 +1,33 @@
+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# optipng
+
+> PNG file optimization utility.
+> More information: <http://optipng.sourceforge.net>.
+
+- Compress a PNG with default settings:
+
+`optipng {{path/to/file.png}}`
+
+- Compress a PNG with the best compression:
+
+`optipng -o{{7}} {{path/to/file.png}}`
+
+- Compress a PNG with the fastest compression:
+
+`optipng -o{{0}} {{path/to/file.png}}`
+
+- Compress a PNG and add interlacing:
+
+`optipng -i {{1}} {{path/to/file.png}}`
+
+- Compress a PNG and preserve all metadata (including file timestamps):
+
+`optipng -preserve {{path/to/file.png}}`
+
+- Compress a PNG and remove all metadata:
+
+`optipng -strip all {{path/to/file.png}}`