[Frotend] Remove the SideMenu additional items

[filipe-varela]

The SideMenu for now does the job that it needs to do, but it adds more items unnecessarily after the Future Ideas. After that, it should be made a reasonably organization in the items and it should be hidden the SideMenu when it's called a new page. For this latter task, the page should not be a new page, but instead a replacement of the current showing page, to avoid creating multiple new pages - which in return adds more memory and resources to the device.

Tasks:

• Remove the unnecessary items
• Reorganize the SideMenu
• Instead of launching a new page, the app should replace the current one with the chosen by the user (this implies that should be a way to go back to previous page or to a new one)

Current state of the side menu:

[filipe-varela]

Besides this, one could remove for now the Future Ideas section, since, for now, there is no logical advantage to its uses in this first release (at the time of writing this issue, the goal was to make a first release).