Update cheatsheets

mmdc

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# mmdc
+
+> CLI for mermaid, a diagram generation tool with a domain-specific language.
+> A mermaid definition file is taken as input and a SVG, PNG, or PDF file is generated as output.
+> More information: <https://mermaid-js.github.io/mermaid/>.
+
+- Convert a file to the specified format (automatically determined from the file extension):
+
+`mmdc --input {{input.mmd}} --output {{output.svg}}`
+
+- Specify the theme of the chart:
+
+`mmdc --input {{input.mmd}} --output {{output.svg}} --theme {{forest|dark|neutral|default}}`
+
+- Specify the background color of the chart (e.g. `lime`, `"#D8064F"`, or `transparent`):
+
+`mmdc --input {{input.mmd}} --output {{output.svg}} --backgroundColor {{color}}`