Integrate skills-ms

[Defelo]

• course
  • list courses
  • get course summary
  • mark course as visited (watched)
  • get course details
  • get mp4 lecture link
  • stream mp4 lecture (maybe serve directly via nginx instead?)
  • get next unseen lecture
  • mark lecture as completed
  • list accessible courses
  • purchase course
  • internal: list courses
  • admin: crud courses, sections, lessons
  • cli: import course from yaml
• skill
  • crud skill
  • return skills by parent
  • internal: list leaves
  • internal: return skill dependencies
• xp
  • get user xp
  • admin: update xp
  • internal: get skill levels
  • internal: get users by skill xp (graduates)
  • internal: add skill progress
  • internal: get leaderboard
  • internal: get leaderboard user
• database migrator