Update cheatsheets

tldr/presenterm

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# presenterm
+
+> A terminal-based slideshow tool that renders markdown presentations.
+> More information: <https://mfontanini.github.io/presenterm/>.
+
+- Display a presentation:
+
+`presenterm {{path/to/slides.md}}`
+
+- Display a presentation with a specific theme:
+
+`presenterm --theme {{dark|light|tokyonight-storm|...}} {{path/to/slides.md}}`
+
+- List all available themes:
+
+`presenterm --list-themes`
+
+- Export a presentation to PDF:
+
+`presenterm --export-pdf --output {{path/to/output.pdf}} {{path/to/slides.md}}`
+
+- Display a presentation with code snippet execution enabled:
+
+`presenterm --enable-snippet-execution {{path/to/slides.md}}`
+
+- Validate that presentation content fits within the terminal:
+
+`presenterm --validate-overflows {{path/to/slides.md}}`