refactor(users/glittershark): Rename to grfn

Rename my //users directory and all places that refer to glittershark to
grfn, including nix references and documentation.

This may require some extra attention inside of gerrit's database after
it lands to allow me to actually push things.

Change-Id: I4728b7ec2c60024392c1c1fa6e0d4a59b3e266fa
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2933
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>
Reviewed-by: lukegb <lukegb@tvl.fyi>
Reviewed-by: glittershark <grfn@gws.fyi>

users/glittershark/xanthous/src/Xanthous/App/Common.hs

@@ -1,67 +0,0 @@
---------------------------------------------------------------------------------
-module Xanthous.App.Common
-  ( describeEntities
-  , describeEntitiesAt
-  , entitiesAtPositionWithType
-
-    -- * Re-exports
-  , MonadState
-  , MonadRandom
-  , EntityMap
-  , module Xanthous.Game.Lenses
-  , module Xanthous.Monad
-  ) where
---------------------------------------------------------------------------------
-import           Xanthous.Prelude
---------------------------------------------------------------------------------
-import           Data.Aeson (object)
-import qualified Data.Aeson as A
-import           Control.Monad.State (MonadState)
-import           Control.Monad.Random (MonadRandom)
---------------------------------------------------------------------------------
-import           Xanthous.Data (Position, positioned)
-import           Xanthous.Data.EntityMap (EntityMap)
-import qualified Xanthous.Data.EntityMap as EntityMap
-import           Xanthous.Game
-import           Xanthous.Game.Lenses
-import           Xanthous.Game.State
-import           Xanthous.Monad
-import           Xanthous.Entities.Character (Character)
-import           Xanthous.Util.Inflection (toSentence)
---------------------------------------------------------------------------------
-
-entitiesAtPositionWithType
-  :: forall a. (Entity a, Typeable a)
-  => Position
-  -> EntityMap SomeEntity
-  -> [(EntityMap.EntityID, a)]
-entitiesAtPositionWithType pos em =
-  let someEnts = EntityMap.atPositionWithIDs pos em
-  in flip foldMap someEnts $ \(eid, view positioned -> se) ->
-    case downcastEntity @a se of
-      Just e  -> [(eid, e)]
-      Nothing -> []
-
-describeEntitiesAt :: (MonadState GameState m, MonadRandom m) => Position -> m ()
-describeEntitiesAt pos =
-  use ( entities
-      . EntityMap.atPosition pos
-      . to (filter (not . entityIs @Character))
-      ) >>= \case
-        Empty -> pure ()
-        ents  -> describeEntities ents
-
-describeEntities
-  :: ( Entity entity
-    , MonadRandom m
-    , MonadState GameState m
-    , MonoFoldable (f Text)
-    , Functor f
-    , Element (f Text) ~ Text
-    )
-  => f entity
-  -> m ()
-describeEntities ents =
-  let descriptions = description <$> ents
-  in say ["entities", "description"]
-     $ object ["entityDescriptions" A..= toSentence descriptions]