[Freeswitch-docs] No-more-scrolly in the sidebaroli

I did a little house keeping and organized some things. 1. I'm not sure if I'm happy with having the "prototypes" section when obviously there is an examples sections. The idea of having a prototypes section is to show people more complete examples where the examples section could be confined to just snippets. 2. I also added an "auxiliary knowledge and utilities" section. It seems like a good compromise between deleting non-FreeSWITCH documentation, but also not letting it clutter up and ed-emphasize the actual documentation. Please let me know if anything should be changed or if you have any comments on how things should be handled.