Merge branch 'master' into glitch-soc/merge-upstream

Conflicts:
- `Gemfile.lock`:
  Not a real conflict, just a glitch-soc-only dependency too close to a
  dependency that got updated upstream. Updated as well.
- `app/models/status.rb`:
  Not a real conflict, just a change too close to glitch-soc-changed code
  for optionally showing boosts in public timelines.
  Applied upstream changes.
- `app/views/layouts/application.html.haml`:
  Upstream a new, static CSS file, conflict due to glitch-soc's theming
  system, include the file regardless of the theme.
- `config/initializers/content_security_policy.rb`:
  Upstream dropped 'unsafe-inline' from the 'style-src' directive, but
  both files are very different. Removed 'unsafe-inline' as well.

app/services/activitypub/fetch_remote_account_service.rb

@@ -3,6 +3,7 @@
 class ActivityPub::FetchRemoteAccountService < BaseService
   include JsonLdHelper
   include DomainControlHelper
+  include WebfingerHelper
 
   SUPPORTED_TYPES = %w(Application Group Organization Person Service).freeze
 
@@ -35,12 +36,12 @@ class ActivityPub::FetchRemoteAccountService < BaseService
   private
 
   def verified_webfinger?
-    webfinger                            = Goldfinger.finger("acct:#{@username}@#{@domain}")
+    webfinger                            = webfinger!("acct:#{@username}@#{@domain}")
     confirmed_username, confirmed_domain = split_acct(webfinger.subject)
 
     return webfinger.link('self')&.href == @uri if @username.casecmp(confirmed_username).zero? && @domain.casecmp(confirmed_domain).zero?
 
-    webfinger                            = Goldfinger.finger("acct:#{confirmed_username}@#{confirmed_domain}")
+    webfinger                            = webfinger!("acct:#{confirmed_username}@#{confirmed_domain}")
     @username, @domain                   = split_acct(webfinger.subject)
     self_reference                       = webfinger.link('self')
 

app/services/resolve_account_service.rb

@@ -3,6 +3,7 @@
 class ResolveAccountService < BaseService
   include JsonLdHelper
   include DomainControlHelper
+  include WebfingerHelper
 
   class WebfingerRedirectError < StandardError; end
 
@@ -76,7 +77,7 @@ class ResolveAccountService < BaseService
   end
 
   def process_webfinger!(uri, redirected = false)
-    @webfinger                           = Goldfinger.finger("acct:#{uri}")
+    @webfinger                           = webfinger!("acct:#{uri}")
     confirmed_username, confirmed_domain = @webfinger.subject.gsub(/\Aacct:/, '').split('@')
 
     if confirmed_username.casecmp(@username).zero? && confirmed_domain.casecmp(@domain).zero?