fs(3lua): init man pages

Initialise man pages for the fs module.

man/fs/fs.remove.3lua.scd

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+FS.REMOVE(3lua) "3lua" "Callisto manual pages"
+
+# NAME
+*fs.remove* - remove a file or directory
+
+# SYNOPSIS
+*fs.remove*(_path_: *string*)
+
+# DESCRIPTION
+*fs.remove* removes the file or directory at _path_.
+
+If _path_ specifies a file, *fs.remove* removes the file.
+If _path_ specifies a directory, *fs.remove* recursively removes any
+other files or directories inside the directory given,
+and then removes the directory itself once it is empty.
+
+If an error occurs,
+*fs.remove* returns nil, an error message and
+a platform-dependent error code.
+There are many reasons *fs.remove* can fail;
+see rmdir(2) and unlink(2) for possible error values.
+
+## Warning
+This function is capable of destroying large amounts of data on a disk
+very quickly.
+In case of data damage using *fs.remove* or other means, consider
+using data recovery software such as testdisk(8).
+
+# EXAMPLES
+Remove the _tel2_ file:
+
+	fs.remove("tel2")
+
+# SEE ALSO
+callisto(3lua), fs(3lua), fs.rmdir(3lua), unlink(2), rmdir(2)