Finatra - added and updated documentation.

RB_ID=691632
TBR=true

http/README.md

@@ -736,12 +736,11 @@ File Server
 ===============================
 Finatra's file server support is meant for internal apps only. Do not use the fileserver for production apps requiring a robust high performance file serving solution.
 
-All files are served out of src/main/webapp.
+By default, files are served from the classpath. You can use the flag `-doc.root` to customize the classpath root.
 
-To run the server locally with hotloaded files resolved from disk (instead of from classpath), set the following Java System Property
-```scala
-env=dev
-```
+To serve files from the local file system, use the flag `-local.doc.root`. Note that setting Java System Property `-Denv=env` is no longer required nor supported. Setting the `-local.doc.root` flag will trigger the same `localFileMode` behavior. 
+
+Also note that it is **an error** to attempt to set both the `-doc.root` and the `-local.doc.root` flags. Either do nothing to load resources from the base of the classpath, configure a classpath "namespace" by setting the `-doc.root` **or** load files from a local filesystem location specified by the `-local.doc.root` flag.
 
 ## File Serving Examples
 

project/plugins.sbt

@@ -8,6 +8,5 @@ addSbtPlugin("com.eed3si9n" % "sbt-unidoc" % "0.3.2")
 addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.13.0")
 addSbtPlugin("pl.project13.scala" % "sbt-jmh" % "0.1.8")
 addSbtPlugin("com.twitter" %% "scrooge-sbt-plugin" % "3.15.0")
-addSbtPlugin("com.typesafe.sbt" % "sbt-pgp" % "0.8.3")
 addSbtPlugin("org.scoverage" % "sbt-scoverage" % "1.0.4")
 addSbtPlugin("org.scoverage" % "sbt-coveralls" % "1.0.0")