Propose a modified documentation structure

Created by: stefaniapedrazzi

Here is a proposal for a slightly modified documentation structure that would make use of the Markdown section to create anchors to functions.

Please tell me what do you think. Here you can see the resulting page: https://github.com/tasostefas/opendr_internal/blob/37cebd0474bf39282499c24bcc059bcbd41998cd/docs/reference/lightweight-open-pose.md