calligra*: add pages (#9565)

* Add `calligra` pages:
- `calligrastage`
- `calligrawords`
- `calligrasheets`

* Add examples without arguments

* Add `calligraflow` page

* Add `See also` links

* Simplify grammar for the last examples

pages/common/calligraflow.md

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+# calligraflow
+
+> Calligra's flowchart and diagram application.
+> See also: `calligrastage`, `calligrawords`, `calligrasheets`.
+> More information: <https://manned.org/calligraflow>.
+
+- Launch the flowchart and diagram application:
+
+`calligraflow`
+
+- Open a specific file:
+
+`calligraflow {{path/to/file}}`
+
+- Display help or version:
+
+`calligraflow --{{help|version}}`

pages/common/calligrasheets.md

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+# calligrasheets
+
+> Calligra's spreadsheet application.
+> See also: `calligraflow`, `calligrastage`, `calligrawords`.
+> More information: <https://manned.org/calligrasheets>.
+
+- Launch the spreadsheet application:
+
+`calligrasheets`
+
+- Open a specific spreadsheet:
+
+`calligrasheets {{path/to/spreadsheet}}`
+
+- Display help or version:
+
+`calligrasheets --{{help|version}}`

pages/common/calligrastage.md

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+# calligrastage
+
+> Calligra's presentation application.
+> See also: `calligraflow`, `calligrawords`, `calligrasheets`.
+> More information: <https://manned.org/calligrastage>.
+
+- Launch the presentation application:
+
+`calligrastage`
+
+- Open a specific presentation:
+
+`calligrastage {{path/to/presentation}}`
+
+- Display help or version:
+
+`calligrastage --{{help|version}}`

pages/common/calligrawords.md

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+# calligrawords
+
+> Calligra's word processor application.
+> See also: `calligraflow`, `calligrastage`, `calligrasheets`.
+> More information: <https://manned.org/calligrawords>.
+
+- Launch the word processor application:
+
+`calligrawords`
+
+- Open a specific document:
+
+`calligrawords {{path/to/document}}`
+
+- Display help or version:
+
+`calligrawords --{{help|version}}`