Minor styling changes

Minor styling changes:
1)  Reduced empty space beneath the submenus;
2)  FontFamily definition in a separate class for better reusability;
3)  Reducing font-size for menu items;
4)  Removing vertical-align - middle from * selector.
Styling for menu items

Styling for menu items - Now tagging with new class name for
font-family.
Updating Image name used for Logo

Updating Image name used for Logo - From ThreeCurves... to Lavnok.
Renaming Logo to a better name

Renaming Logo to a better name - ThreeCurvesThick... to Lavnok.