Move pages under tldr, lint run.sh, update docs

tldr/linux/cal

@@ -0,0 +1,37 @@
+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# cal
+
+> Display a calendar with the current day highlighted.
+> More information: <https://manned.org/cal>.
+
+- Display a calendar for the current month:
+
+`cal`
+
+- Display [3] months spanning the date:
+
+`cal -3`
+
+- Display the whole calendar for the current [y]ear:
+
+`cal --year`
+
+- Display the next twelve months:
+
+`cal --twelve`
+
+- Use Monday as the first day of the week:
+
+`cal --monday`
+
+- Display a calendar for a specific year (4 digits):
+
+`cal {{year}}`
+
+- Display a calendar for a specific month and year:
+
+`cal {{month}} {{year}}`