Rename "beta" to "prototype" and document support policy


Rename "beta" to "prototype" and document support policy

Fixes T6084. Changes:

  • Rename phabricator.show-beta-applications to phabricator.show-prototypes, to reinforce that these include early-development applications.
  • Migrate the config setting.
  • Add an explicit "no support" banner to the config page.
  • Rename "Beta" to "Prototype" in the UI.
  • Use "bomb" icon instead of "half star" icon.
  • Document prototype applications in more detail.
  • Explicitly document that we do not support these applications.

Test Plan:

  • Ran migration.
  • Resolved "obsolete config" issue.
  • Viewed config setting.
  • Browsed prototypes in Applications app.
  • Viewed documentation.

Reviewers: chad, btrahan

Reviewed By: btrahan

Subscribers: epriestley, hach-que

Maniphest Tasks: T6084

Differential Revision: https://secure.phabricator.com/D10493