D-Net

Added a mock implementation of the Metrics page

Fixed an issue with the body classes

- Removed the Sign In and Register links from the top right menu in the landing page
- Fixed some styling alignment issues in the carousel

Added some under construction pages, some images for selecting repository type, and cleaned the template interface a bit

Fixed the left-side menu minimalize

Left side menu bar now with fixed position

form controls now have a 2px radius instead of 4px

In the datasource registration when from the countries listbox the 'none selected' choice is made, do not add the loader because no async call will be made

Reimplemented the user registration page

Removed some classes that caused some problems in the landing page menu items