Update Vision, UML model and Issues to include version 0.1 functionality

[etavela]

Version 0.1 will include:

• GitHub integration
• Project configuration
• Resource configuration
• Project Task view
  • Includes total hours
  • Sort / filter on resource, discipline, dates

ACs:

• Domain model updated with necessary entities
• User Journeys created
• Vision updated with features, additional content as needed
• Use Case Model updated
• Issues added for Epics and initial User Stories