ActivityPub: Add basic, read-only support for Outboxes, Notes, and Create/Announce Activities (#2197)

* Clean up collapsible components

* Expose user Outboxes and AS2 representations of statuses

* Save work thus far.

* Fix bad merge.

* Save my work

* Clean up pagination.

* First test working.

* Add tests.

* Add Forbidden error template.

* Revert yarn.lock changes.

* Fix code style deviations and use localized instead of hardcoded English text.

app/views/activitypub/types/announce.activitystreams2.rabl

@@ -0,0 +1,3 @@
+extends 'activitypub/intransient.activitystreams2.rabl'
+
+node(:type) { 'Announce' }

app/views/activitypub/types/collection.activitystreams2.rabl

@@ -0,0 +1,5 @@
+extends 'activitypub/intransient.activitystreams2.rabl'
+
+node(:type)       { 'Collection' }
+node(:items)      { [] }
+node(:totalItems) { 0 }

app/views/activitypub/types/create.activitystreams2.rabl

@@ -0,0 +1,3 @@
+extends 'activitypub/intransient.activitystreams2.rabl'
+
+node(:type) { 'Create' }

app/views/activitypub/types/note.activitystreams2.rabl

@@ -0,0 +1,3 @@
+extends 'activitypub/intransient.activitystreams2.rabl'
+
+node(:type) { 'Note' }

app/views/activitypub/types/ordered_collection.activitystreams2.rabl

@@ -0,0 +1,3 @@
+extends 'activitypub/types/collection.activitystreams2.rabl'
+
+node(:type) { 'OrderedCollection' }

app/views/activitypub/types/ordered_collection_page.activitystreams2.rabl

@@ -0,0 +1,4 @@
+extends 'activitypub/types/ordered_collection.activitystreams2.rabl'
+
+node(:type)     { 'OrderedCollectionPage' }
+node(:current)  { request.original_url }