Remove deprecated specs from `dactyl-config.yml`

[sappenin]

Certain RFCs are still contained in the dactyl-config.yml (see here). If an RFC is no longer defined in the main rfcs repo (for example, it has been moved to the deprecated folder) then we should remove it from the dactyl config.

To determine this, we probably need to perform an audit of all RFC specs defined in the dactyl config file. Additionally, we should compare this against what's actually on interledger.org in the side-bar.

I can't assign this to @LoisRP, but this relates to #132.

@mDuo13 @ryangyoung

[LoisRP]

I believe this has been resolved now with the latest merge.