Admin updates; opportunity interest; about page

Admin panel update to support managing groups at opportunity + challenge
Ability to register interest in an opportunity
Usability updates
About page

Token handling; UI fixes

Merge pull request #299 from cherrytwist/develop

Updated token handling with refresh; UI updates

UI Refinements; stability

Large set of UI refinements
Stability updates re user creation, login

Major update

Updates to opportunity pages
UX review updates
Login handling improvements
...

v0.4.3

Search no longer loads all users

v0.4.2

Fixed build issue in v0.4.1

Admin client bug fixes
Admin client remove user
Admin client improved navigation
Admin breadcrumbs support
Projects wired up the opportunities
Opportunity page enhancements: relations
New project support
Challenge lead logos beside challenges
Improved search funcitonality, including connection to server + tagsets

v0.4.1dev

Admin client bug fixes
Admin client remove user
Admin client improved navigation
Admin breadcrumbs support
Projects wired up the opportunities
Opportunity page enhancements: relations
New project support
Challenge lead logos beside challenges
Improved search funcitonality, including connection to server + tagsets

v0.4.1

Admin client bug fixes
Admin client remove user
Admin client improved navigation
Admin breadcrumbs support
Projects wired up the opportunities
Opportunity page enhancements: relations
New project support
Challenge lead logos beside challenges
Improved search funcitonality, including connection to server + tagsets

v0.4.0

Initial seach support
Opportunity pages
Admin functionality extended
Data wired in
No hard coded environment variables

v0.3.1

Additional wiring and connection to data
Additional components: search box, navigation rings
Admin functionality now with groups and expanded user profile mgmt