Remove unused classes from Scaladoc

Several elements of the old Scaladoc are not in use anymore. To help
with any reverting, the removal of these is done in a single commit
(this one).

The removal includes:

- Old `Index`, the old top "index.html"
- The letter index (with "_" and "deprecated")
- The old `Template` which is superceded by `Entity`

2 files changed, 0 insertions, 22 deletions

diff --git a/src/scaladoc/scala/tools/nsc/doc/doclet/Generator.scala b/src/scaladoc/scala/tools/nsc/doc/doclet/Generator.scala
index 42b56aa927..b4ede6d358 100644
--- a/src/scaladoc/scala/tools/nsc/doc/doclet/Generator.scala
+++ b/src/scaladoc/scala/tools/nsc/doc/doclet/Generator.scala
@@ -9,7 +9,6 @@ import scala.collection._
   * to configure what data is actually available to the generator:
   *  - A `Universer` provides a `Universe` data structure representing the interfaces and comments of the documented
   *    program.
-  *  - An `Indexer` provides precalculated indexing information about a universe.
   * To implement this class only requires defining method `generateImpl`. */
 abstract class Generator {
 
diff --git a/src/scaladoc/scala/tools/nsc/doc/doclet/Indexer.scala b/src/scaladoc/scala/tools/nsc/doc/doclet/Indexer.scala
deleted file mode 100644
index 12fee69cca..0000000000
--- a/src/scaladoc/scala/tools/nsc/doc/doclet/Indexer.scala
+++ /dev/null
@@ -1,21 +0,0 @@
-package scala.tools.nsc
-package doc
-package doclet
-
-/** A `Generator` may implement the `Indexer` trait to gain access to pre-calculated indexing information */
-trait Indexer extends Generator with Universer {
-
-  protected var indexField: Index = null
-
-  def index: Index = indexField
-
-  def setIndex(i: Index) {
-    assert(indexField == null)
-    indexField = i
-  }
-
-  checks += { () =>
-    indexField != null
-  }
-
-}