onefetch: add page (#13924)

Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>

pages/common/onefetch.md

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+# onefetch
+
+> Display project information and code statistics for a local Git repository.
+> More information: <https://github.com/o2sh/onefetch/wiki>.
+
+- Display statistics for the Git repository in the current working directory:
+
+`onefetch`
+
+- Display statistics for the Git repository in the specified directory:
+
+`onefetch {{path/to/directory}}`
+
+- Ignore commits made by bots:
+
+`onefetch --no-bots`
+
+- Ignore merge commits:
+
+`onefetch --no-merges`
+
+- Don't print the ASCII art of the language logo:
+
+`onefetch --no-art`
+
+- Show `n` authors, languages, or file churns (default: 3, 6, and 3 respectively):
+
+`onefetch --number-of-{{authors|languages|file-churns}} {{n}}`
+
+- Ignore the specified files and directories:
+
+`onefetch {{-e|--exclude}} {{path/to/file_or_directory|regular_expression}}`
+
+- Only detect languages from the specified categories (default: programming and markup):
+
+`onefetch {{-T|--type}} {{programming|markup|prose|data}}`