Add custom subsections in education

[BernatBC]

Issue

Fixes #400

Description

Added custom subsections in education cards. The configuration is the following:

degrees:
- name: Degree name
    # Other configs
    custonSections:
    - name: Subsection Title
      content: Content
    - name: Subsection Title 2
      content: Content 2

Test Evidence

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[hossainemruz]

Thank you @BernatBC for the PR. Added a comment. Please, take a look.

[BernatBC]

Ok @hossainemruz ,
I've applied that change. What's your view on this change?

[hossainemruz]

The change looks good. Any screenshot?

[BernatBC]

[hossainemruz]

Thank you @BernatBC. Looks good now.