Add version browsing for nightlies

Author: BarkingBad

docs/index.html

@@ -34,6 +34,11 @@
                             Docs
                         </a>
                     </li>
+                    <li class="nav-item">
+                        <a class="nav-link" href="api/index.html">
+                            API
+                        </a>
+                    </li>
                     <li class="nav-item">
                         <a class="nav-link" href="https://github.com/lampepfl/dotty">
                             <i class="fab fa-github"></i>

project/Build.scala

@@ -1284,7 +1284,10 @@ object Build {
         scalaSrcLink(stdLibVersion, srcManaged(dottyNonBootstrappedVersion, "scala") + "="),
         dottySrcLink(referenceVersion, srcManaged(dottyNonBootstrappedVersion, "dotty") + "=", "#library/src"),
         dottySrcLink(referenceVersion),
-      ) ++ scalacOptionsDocSettings ++ revision ++ params ++ targets ++ Seq("-Ygenerate-inkuire")
+        "-Ygenerate-inkuire",
+        "-versions-dictionary-url",
+        "https://scala-lang.org/api/versions.json"
+      ) ++ scalacOptionsDocSettings ++ revision ++ params ++ targets
       import _root_.scala.sys.process._
       val escapedCmd = cmd.map(arg => if(arg.contains(" ")) s""""$arg"""" else arg)
       Def.task {