Update cheatsheets

zstd

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# zstd
+
+> Compress or decompress files with Zstandard compression.
+> More information: <https://github.com/facebook/zstd>.
+
+- Compress a file into a new file with the `.zst` suffix:
+
+`zstd {{path/to/file}}`
+
+- Decompress a file:
+
+`zstd --decompress {{path/to/file.zst}}`
+
+- Decompress to `stdout`:
+
+`zstd --decompress --stdout {{path/to/file.zst}}`
+
+- Compress a file specifying the compression level, where 1=fastest, 19=slowest and 3=default:
+
+`zstd -{{level}} {{path/to/file}}`
+
+- Unlock higher compression levels (up to 22) using more memory (both for compression and decompression):
+
+`zstd --ultra -{{level}} {{path/to/file}}`