Provide rough draft of better project organization

src/invidious/jobs.cr

@@ -0,0 +1,13 @@
+module Invidious::Jobs
+  JOBS = [] of BaseJob
+
+  def self.register(job : BaseJob)
+    JOBS << job
+  end
+
+  def self.start_all
+    JOBS.each do |job|
+      spawn { job.begin }
+    end
+  end
+end