Fix HTML formatting and non-conformance.

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@225022 91177308-0d34-0410-b5e6-96231b3b80d8
Update the website with information about LLDB on Windows.

This patch updates the list of supported platforms to include
Windows, and also provides some detailed getting started instructions
for building LLDB on Windows.

Differential Revision: http://reviews.llvm.org/D6805

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@225023 91177308-0d34-0410-b5e6-96231b3b80d8