Styling & Code Improvements

[iorrah]

During the work on this branch, the following modifications have been applied:

• Revising file namings, paths and importation approaches;
• Updating the Code Climate checks definitions;
• Repository presentation amends;
• Responsiveness styling implementations (addresses https://github.com/iorrah/transfersmart/issues/20);
• Abstracting the Media Query variable declarations into a single file.