split tree.md into linux and osx versions, to cater to the different sets of available options

pages/common/tree.md

@@ -1,27 +0,0 @@
-# tree
-
-> Show the contents of the current directory as a tree.
-
-- Show files and directories up to 'num' levels of depth (where 1 means the current directory):
-
-`tree -L {{num}}`
-
-- Show directories only:
-
-`tree -d`
-
-- Show hidden files too:
-
-`tree -a`
-
-- Print the tree without indentation lines, showing the full path instead:
-
-`tree -i -f`
-
-- Print the size of each node next to it, in human-readable format, with folders displaying their cumulative size (as in the `du` command):
-
-`tree -s -h --du`
-
-- Filter the tree using a wildcard (glob) pattern, showing only the hierarchies leading to the matching entries:
-
-`tree -P {{*.txt}} --prune`