Replace doc pages with redirects to versioned doc pages.

* Add a new `redirect` Jekyll layout.
* Replace all pages under docs/ with redirects to corresponding page under
  versions/master/.
* Prepend links on Documentation sidebar, including generated navs for the
  Skylark Library and Build Encyclopedia, with prefix for versioned directory.
* Add code to both the internal jekyll-config.sh and external jekyll-tree.sh
  to add redirect pages for the Skylark Library and Build Encyclopedia.
* Bring the branched User Manual doc up to date with latest changes.

--
MOS_MIGRATED_REVID=131568800

1 files changed, 2 insertions, 81 deletions

diff --git a/site/docs/windows.md b/site/docs/windows.md
index a63761179c..8bf61e0e3b 100644
--- a/site/docs/windows.md
+++ b/site/docs/windows.md
@@ -1,83 +1,4 @@
 ---
-layout: documentation
-title: Windows
+layout: redirect
+redirect: docs/windows.html
 ---
-
-Building Bazel on Windows
-=========================
-
-Windows support is highly experimental. Known issues are [marked with
-label "Windows"](https://github.com/bazelbuild/bazel/issues?q=is%3Aissue+is%3Aopen+label%3A%22category%3A+multi-platform+%3E+windows%22)
-on github issues.
-
-We currently support only 64 bit Windows 7 or higher and we compile Bazel as a msys2 binary.
-
-To bootstrap Bazel on Windows, you will need:
-
-*    Java JDK 8 or later
-*    [Visual Studio](https://www.visualstudio.com/) (Community Edition is okay)
-*    [msys2](https://msys2.github.io/) (need to be installed at
-     ``C:\tools\msys64\``).
-*    Several msys2 packages. Use the ``pacman`` command to install them:
-     ``pacman -S gcc git curl zip unzip zlib-devel``
-
-To build Bazel:
-
-*    Open the msys2 shell.
-*    Clone the Bazel git repository as normal.
-*    Set the environment variables:
-
-```bash
-export JAVA_HOME="$(ls -d C:/Program\ Files/Java/jdk* | sort | tail -n 1)"
-export BAZEL_SH=c:/tools/msys64/usr/bin/bash.exe
-```
-
-*     Run ``compile.sh`` in Bazel directory.
-*     If all works fine, bazel will be built at ``output\bazel.exe``.
-
-Using Bazel on Windows
-======================
-
-Bazel currently supports building C++ targets and Java targets on Windows.
-
-### Build C++
-
-To build C++ targets, you will need:
-
-* [Visual Studio](https://www.visualstudio.com/)
-<br/>We are using MSVC as the native C++ toolchain, so please ensure you have Visual
-Studio installed with the Visual C++ components
-(which is NOT the default installation type of Visual Studio).
-
-* [Python 2.7](https://www.python.org/downloads/)
-<br/>Currently, we use python wrapper scripts to call the actual MSVC compiler, so
-please make sure Python is installed and its location is added into PATH.
-It's also a good idea to set BAZEL\_PYTHON environment variable to tell Bazel
-where python is.
-<br/>For example: `export BAZEL_PYTHON=C:/Python27/python.exe`
-
-Bazel will auto-configure the location of Visual Studio and Python at the first
-time you build any target.
-If you need to auto-configure again, just run `bazel clean` then build a target.
-
-If everything is set up, you can build C++ target now! However, since MSVC
-toolchain is not default on Windows yet, you should use flag
-`--cpu=x64_windows_msvc` to enable it like this:
-
-```bash
-$ bazel build --cpu=x64_windows_msvc examples/cpp:hello-world
-$ ./bazel-bin/examples/cpp/hello-world.exe
-$ bazel run --cpu=x64_windows_msvc examples/cpp:hello-world
-```
-
-### Build Java
-
-Building Java targets works well on Windows, no special configuration is needed.
-Just try:
-
-```bash
-$ bazel build examples/java-native/src/main/java/com/example/myproject:hello-world
-$ ./bazel-bin/examples/java-native/src/main/java/com/example/myproject/hello-world
-$ bazel run examples/java-native/src/main/java/com/example/myproject:hello-world
-```
-