WIP : add dashboard personal news

[Code-Hello]

• add personal news in Dashboard :

  • add org chart card
  • add my roles card
  • add my meetings card
  • add my threads card
  • add my tasks card

• some refacto made for MemberRoles

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[Godefroy]

Merci pour les modifs !

J'ai rajouté ma touche et j'ai mergé dans #112 🎉