008-dthreads-fibonacci: code cleanup

Signed-off-by: Eduardo Silva <eduardo@monkey.io>
080-dthread-fibonacci: rename

Signed-off-by: Eduardo Silva <eduardo@monkey.io>
004 Post 01: new POST example

Signed-off-by: Eduardo Silva <eduardo@monkey.io>
004 Post 01: update README

Signed-off-by: Eduardo Silva <eduardo@monkey.io>