highlight: add page (#6723)

Co-authored-by: marchersimon <50295997+marchersimon@users.noreply.github.com>
Co-authored-by: Axel Navarro <navarroaxel@gmail.com>

pages/common/highlight.md

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+# highlight
+
+> Outputs syntax-highlighted source code to a variety of formats.
+> More information: <http://www.andre-simon.de/doku/highlight/highlight.php>.
+
+- Produce a complete HTML document from a source code file:
+
+`highlight --out-format={{html}} --style {{theme_name}} --syntax {{language}} {{path/to/source_code}}`
+
+- Produce an HTML fragment, suitable for inclusion in a larger document:
+
+`highlight --out-format={{html}} --fragment --syntax {{language}} {{source_file}}`
+
+- Inline the CSS styling in every tag:
+
+`highlight --out-format={{html}} --inline-css --syntax {{language}} {{source_file}}`
+
+- List all supported languages, themes, or plugins:
+
+`highlight --list-scripts {{langs|themes|plugins}}`
+
+- Print a CSS stylesheet for a theme:
+
+`highlight --out-format={{html}} --print-style --style {{theme_name}} --syntax {{language}}] --stdout`