feat: organization pages

[ruilopesm]

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TODO

• Index of organizations
  • Search feature
  • Pagination
  • GitHub-like card for each organization
  • Make use of streams
  • Fix bug when searching after changing pages (another one 😩)
  • Create helper functions for generating social media links and for providing social icons
• Show of an organization (move sidebar entries to be accessible from the show page)
  • Posts tab
  • Departments tab
  • Partners tab
  • Members tab (can still be improved)
  • About tab
    • Show website favicon
• Create an organization (only masters can do so)
• Edit an organization (only admins or owners on that organization can do so)
• Permissions system inside the organization
• Handlers for an organization (like @cesium)
• Page for managing organizations members (followers, admins and owners), with an information dialog about what each role does
  • Export functionality
• Ensure all pages are responsive
• Children organizations
• Identicon as organization's logo placeholder
• Address all TODO and FIXME around the code