feat: set default typography

[andrey-canon]

Description

This add the default font for the NELC implementation. Migration pr of #6
Issue # 1435

Before

After

How to test

1. Set the learning MFE as a volume
2. Add the module.config.js file into the frontend-app-learning folder and restart your container

module.exports = {
    localModules: [
        { moduleName: '@edx/brand', dir: '../brand-openedx'},
    ],
};

3. Checkout this branch
4. In redwood the styles loaded automatically due to this file however those lines were removed in this version so you have to import the brand package explicitly in the frontend-app-learning/src/index.scss file, add the following lines at the top of the file after the last import statement.

@import "@edx/brand/paragon/fonts";
@import "@edx/brand/paragon/variables";
@import "@edx/brand/paragon/overrides";

[johanseto]

Working in my local env