Changes

• Improve documentation

• Add headerOverride to EdgeFunction

• Change PostgrestResult back to data class (for accessing headers after a postgrest request)

• Add a completely new demo and remove the old ones (see README)

• Add new dokka documentation (https://supabase-community.github.io/supabase-kt/)

Full Changelog: 0.8.0-alpha-1...0.8.0-beta-1