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

tldr/pngquant

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pngquant
+
+> PNG converter and lossy image compressor.
+> More information: <https://pngquant.org/>.
+
+- Compress a specific PNG as much as possible and write result to a new file:
+
+`pngquant {{path/to/file.png}}`
+
+- Compress a specific PNG and override original:
+
+`pngquant --ext .png --force {{path/to/file.png}}`
+
+- Try to compress a specific PNG with custom quality (skip if below the min value):
+
+`pngquant --quality {{0-100}} {{path/to/file.png}}`
+
+- Compress a specific PNG with the number of colors reduced to 64:
+
+`pngquant {{64}} {{path/to/file.png}}`
+
+- Compress a specific PNG and skip if the file is larger than the original:
+
+`pngquant --skip-if-larger {{path/to/file.png}}`
+
+- Compress a specific PNG and remove metadata:
+
+`pngquant --strip {{path/to/file.png}}`
+
+- Compress a specific PNG and save it to the given path:
+
+`pngquant {{path/to/file.png}} --output {{path/to/file.png}}`
+
+- Compress a specific PNG and show progress:
+
+`pngquant --verbose {{path/to/file.png}}`