First quick Sure rebrand (#74)

* First cut of smallest rebrand, pending icons

* Leave SQL schema tokens/user names the same for now

* First batch of logos

* Release notes/what's new

* /releases missing

* redirect_uri for sureapp://

* Padded logo

* Test the correct /releases URL

* Missed a few mobile URIs

* Some icons/asssets from /website/ repo

* Seed/sample data user @sure.local now

* New screenshot

* Want to keep their legal "boilerplate" from the upstream repo

app/models/provider/github.rb

@@ -2,8 +2,8 @@ class Provider::Github
   attr_reader :name, :owner, :branch
 
   def initialize
-    @name = "maybe"
-    @owner = "maybe-finance"
+    @name = "sure"
+    @owner = "we-promise"
     @branch = "main"
   end