feat: in mail join organization actions

[phoebus-84]

• feat: nru join organizations page
• style: better join page
• refactor: go to my organization after keypairoom generation
• fix: resctrict join organization requestes views to admin and owner only
• fix: add link to acceptance in ask-to-join email
• fix: user cell in pending join requests table
• feat: handle authenticated actions inside emails
• fix: protect accept/reject join organization route