Feature/#66 average of open ict criteria

Summary

Made a new /api/skills/all API call. Returns the averages of all skills from all informal reviews.

Related issues:

Closes #66 (closed)

Changes

• Docker-compose.yml has been edited according to @Ryan 's discretion.

Inside Frontend/

• Added radar chart to dashboard

Inside Public/

• Added route to /api/skills/all

Inside Learning/

• Added route to /api/skills/all
• Added /api/skills/all api call

Before merge

• Changed code has been reviewed
• Tested to build, start and is usable