Backmerge main 14 jan 2021 (zio#831)

* Doc: Add outline (zio#815)

* doc: add categories

* refactor: doc structure refactored

* fix: package-lock.json removed

* refactor: create outline sub-directories

* refactor: rename test to testing

* Update netty-all to 4.1.73.Final (zio#811)

* Feature: API to modify headers (zio#824)

* feat(Headers):added new api to update headers

* renamed api

* Feature: Signed Cookie (zio#751)

* feat(cookie): added secret in cookie

* feat(cookie): added signcookie middleware

* feat(cookie): scalafmt

* fix(cookie): sign cookie while encoding

* scalafmt

* fix(Cookie): added unsign method for cookie

* fix(cookie): minor changes

* fix(signCookieMiddleware: simplified signCookies

* fix(cookie): removed try catch from signContent

* cookie: throw error in verify

* cookie: throw error in verify

* verify method changes

* fixed test cases

* fix: removed decodeResponseSignedCookie

* fix: middlewareSpec

* added modifyheaders in middleware

* removed unwanted changes

* scalafmt

* refactoring

* refactoring

* build fix

* build fix

* fix: decodeResponseCookie

* added modify

* Update sbt-scalafix to 0.9.34 (zio#805)

* Fix: Echo streaming (zio#828)

* Failing test

* Fix echo streaming

* Pr Comments

* ZIO 2 support (zio#809)

* upgrade to zio 2.0.0-RC1

* bump timeout for failing test

* other fixes

* increase timeout

* rejigger broken test

* try, try again

* get compiling & tests passing

Co-authored-by: Kit Langton <kit.langton@gmail.com>

* ZIO2 changes

* scalafmt

* renamed

Co-authored-by: Shubham Girdhar <girdharshubham@hotmail.com>
Co-authored-by: Shruti Verma <62893271+ShrutiVerma97@users.noreply.github.com>
Co-authored-by: John A. De Goes <john@degoes.net>
Co-authored-by: Kit Langton <kit.langton@gmail.com>

example/src/main/scala/example/SignCookies.scala

@@ -17,6 +17,5 @@ object SignCookies extends ZIOAppDefault {
   }
 
   // Run it like any simple app
-  val run =
-    Server.start(8090, app).exitCode
+  val run = Server.start(8090, app)
 }

zio-http/src/main/scala/zhttp/http/Middleware.scala

@@ -1,15 +1,8 @@
 package zhttp.http
 
-import io.netty.handler.codec.http.HttpHeaderNames
-import io.netty.util.AsciiString.contentEqualsIgnoreCase
-import zhttp.http.CORS.DefaultCORSConfig
-import zhttp.http.Headers.BasicSchemeName
-import zhttp.http.Middleware.{Flag, RequestP}
+import zhttp.http.middleware.Web
 import zio._
 
-import java.io.IOException
-import java.util.UUID
-
 /**
  * Middlewares are essentially transformations that one can apply on any Http to produce a new one. They can modify
  * requests and responses and also transform them into more concrete domain entities.

zio-http/src/test/scala/zhttp/service/WebSocketServerSpec.scala

@@ -0,0 +1 @@
+