Reduce deployment complexity and refactor internals

[aeneasr]

Closes #177

Todo:

• judge api -> decision api
• Update docs
  • Write cool docs showcasing the 3-legged processing pipeline
  • Split sections (authz, authn, mutator)
  • Document how JWKs works now. Note that HS256 will not be sent in well-known
  • Update upgrade guide
• Write JWKs generator cli
• Check "valid" of various pipelines
• Figure out unique identifier for metrics package as well as isDevelopment
• Load rules from remote/fs/env
• Add glob matcher (?)

unstructured notes

### scope is being transformed to scp always!!

### all env vars have been renamed but you can use older ones np

### everything is disabled by default you must enable it explicitly

### id token

jwks are now no longer fetched from hydra

instead you can use `oathkeeper credentials generate [--alg <RS256>] [--bits <2048|4096>] <transformer_id_token>`

jwk-keygen --use sig --alg RS256 --bits 4096

### renamed

cookies -> cookie
headers -> header
credentials issuer -> mutator

### new

* new unauthorized authorizer

### Rule changes

Credential Issuer -> (Request) Transformer

### RSA key

* should no be imported from file/env

* should still work with hydra though

### Serve Changes

* serve api -> stays the same
* serve proxy -> expose 2 ports, one proxy on api for health check, metrics and so on

### SQL Store Deprecation

SQL -> in memory / from disk