Set basic frontend layout

# Basic frontend layout

There is a need for a frontend with the following sections:

## Login
Page where a user is authenticated and get access to the platform

## Register Level form
Section where a user can register new levels.

Only privileged members can create official levels which are part of the main story. Any member can create any level using an existing entrypoint of an official level as a startpoint or, any entrypoint of other unofficial level that should be specified as a dependency.

## View registered levels section
Section where a user can see already registered levels.

## Restrictions
- The use of JQuery should be avoided.