[static] use servant static file server

This is instead of the Servant.Static.TH which bundles the files at
compilation into the binary.

devops/docker/Dockerfile

-from fpco/stack-build:lts-14.22
+from fpco/stack-build:lts-14.6
 
 RUN apt-get update && \
     apt-get install -y git libigraph0-dev && \

src/Gargantext/API.hs

@@ -319,7 +319,7 @@ type GargPrivateAPI' =
 
 type API = SwaggerAPI
        :<|> FrontEndAPI
-       :<|> Get '[HTML] Html
+       -- :<|> Get '[HTML] Html
        :<|> GargAPI
 
 -- This is the concrete monad. It needs to be used as little as possible,
@@ -341,7 +341,7 @@ server env = do
   -- orchestrator <- scrapyOrchestrator env
   pure $  schemaUiServer swaggerDoc
      :<|> frontEndServer
-     :<|> serverStatic
+     -- :<|> serverStatic
      :<|> hoistServerWithContext (Proxy :: Proxy GargAPI) (Proxy :: Proxy AuthContext) transform serverGargAPI
   where
     transform :: forall a. GargServerM env GargError a -> Handler a

src/Gargantext/API/FrontEnd.hs

@@ -12,15 +12,16 @@ Loads all static file for the front-end.
 -}
 
 {-# LANGUAGE NoImplicitPrelude #-}
-{-# LANGUAGE DataKinds         #-}
-{-# LANGUAGE TemplateHaskell   #-}
+{-# LANGUAGE DataKinds            #-}
+{-# LANGUAGE TypeOperators        #-}
 
 ---------------------------------------------------------------------
 module Gargantext.API.FrontEnd where
 
-import Servant.Static.TH (createApiAndServerDecs)
+import Servant
+import Servant.Server.StaticFiles (serveDirectoryWebApp)
 
----------------------------------------------------------------------
-$(createApiAndServerDecs "FrontEndAPI" "frontEndServer" "purescript-gargantext/dist")
----------------------------------------------------------------------
+type FrontEndAPI = Raw
 
+frontEndServer :: Server FrontEndAPI
+frontEndServer = serveDirectoryWebApp "./purescript-gargantext/dist"

stack.yaml

-resolver: lts-14.22
+resolver: lts-14.27
 flags: {}
 extra-package-dbs: []
 packages:
@@ -7,7 +7,7 @@ packages:
 
 docker:
   enable: false
-  repo: 'fpco/stack-build:lts-14.22-garg'
+  repo: 'fpco/stack-build:lts-14.27-garg'
 
 nix:
   enable: false
@@ -72,6 +72,7 @@ extra-deps:
 - serialise-0.2.0.0
 - servant-flatten-0.2
   #- servant-multipart-0.11.2
+- servant-server-0.16
 - stemmer-0.5.2
 - time-units-1.0.0
 - validity-0.9.0.0 # patches-{map,class}