feat(set up placeholders for layout): set up placeholders for layout

Description

Created layout for app.

What has been done:

• Added index.js at pages to set root path for SPA
• Added MinervaSPA page under domain components as page for page load
• Added FunctionalArea placeholder divided into 3 subcomponents. Absolute position was inspired by googlemaps layout
• Added Map component as placeholder for map. Decided to make it full screen. Inspired by google maps layout

Additionally:

• Normalized css