As a developer or client, I should be able to view an app in a standalone page

[willmcvay]

Background context or User story:

Currently, as a user client or developer, I view app details in a modal. These modals have grown too small for their use case so require a standalone app page

Specification or Acceptance Criteria:

• I should be able to view the same app details shown in the modal on the client/manage client/apps and developer/apps pages in standalone pages by creating client/apps/:id and developer/apps/:id routes.
• Currently we just want to render the exact content we have in the modals in a 2 column grid (desktop), 1/3 / 2/3 split - see: https://github.com/marketplace/rollbar for an example layout.
• Detail rendered above the carousel to be in the left column, detail rendered below and including the carousel in the right hand column.
• In tablet and below, the left column should stack above the right column and both be full width
• UI enhancements will be on a second ticket @HollyJoyPhillips to provide.
• Routing too and from these pages should be by direct load of the URL now. Modal functionality should be maintained until the pages are finished (second routing ticket @willmcvay to provide)
• Description field should render HTML see As a developer, I should be able to enhance my app listing description with HTML #1123