message: [www] Updated outdated download links [NFC]
  Also added ubuntu and Arch Linux links.
diff: <div class="post">
  <h1 class ="postheader">LLDB releases</h1>
  <div class="postcontent">
  - <p>Debian packages are available for LLDB 3.2 and later.</p>
  + <p>Debian packages are available for LLDB 3.5 and later.</p>
  <ul>
  - <li><a href="http://packages.debian.org/experimental/lldb-3.4">LLDB 3.4 - incremental release</a> (experimental)</li>
  - <ul>
  - <li><a href="http://packages.debian.org/experimental/amd64/lldb-3.4/download">amd64</a> (x86-64)</li>
  - <li><a href="http://packages.debian.org/experimental/s390/lldb-3.4/download">System/390</a> (i386)</li>
  + <li><a href="https://packages.debian.org/jessie/lldb">jessie - LLDB 3.5</a></li>
  + <li><a href="https://packages.debian.org/stretch/lldb">stretch - LLDB 3.8</a></li>
  + <li><a href="https://packages.debian.org/buster/lldb">buster - LLDB 6.0</a></li>
  + <li><a href="https://packages.debian.org/sid/lldb">sid - LLDB 6.0</a></li>
  </ul>
  - <li><a href="http://packages.debian.org/unstable/lldb-3.3">LLDB 3.3</a> (unstable)</li>
  - <li><a href="http://packages.debian.org/unstable/lldb-3.2">LLDB 3.2</a> (unstable)</li>
  + <p>ubuntu packages are available for LLDB 3.8 and later.</p>
  + <ul>
  + <li><a href="https://packages.ubuntu.com/xenial/lldb">ubuntu 16.04LTS - LLDB 3.8</a></li>
  + <li><a href="https://packages.ubuntu.com/bionic/lldb">ubuntu 18.04LTS - LLDB 6.0</a></li>
  </ul>
  + <p>Arch Linux packages the latest <a href="https://www.archlinux.org/packages/extra/x86_64/lldb/">LLDB 6.0</a></p>
  </div>
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  </div>
  