docs: update roadmap, usage

auth: access_token to authenticated details

improve response handling and skip body parsing if http status is 204

improve response handling and skip body parsing if http status is 204

auth: fix HTTP methods

auth: add apikey to current_user route

upgrade postgrest-go to 0.1.2

update postgrest-go to 0.1.1

make endpoints as consts, expost Auth to public

auth: expost UserCredentials struct