Update cheatsheets

pandoc

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pandoc
+
+> Convert documents between various formats.
+> More information: <https://pandoc.org>.
+
+- Convert file to PDF (the output format is determined by file extension):
+
+`pandoc {{input.md}} -o {{output.pdf}}`
+
+- Force conversion to use a specific format:
+
+`pandoc {{input.docx}} --to {{gfm}} -o {{output.md}}`
+
+- Convert to a standalone file with the appropriate headers/footers (for LaTeX, HTML, etc.):
+
+`pandoc {{input.md}} -s -o {{output.tex}}`
+
+- List all supported input formats:
+
+`pandoc --list-input-formats`
+
+- List all supported output formats:
+
+`pandoc --list-output-formats`