Updated tech overview

src/site/docs/language-tour/index.html

Index: src/site/docs/language-tour/index.html
diff --git a/src/site/docs/language-tour/index.html b/src/site/docs/language-tour/index.html
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--- a/src/site/docs/language-tour/index.html
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----
-layout: default
-title: "A Tour of the Dart Language"
-description: "Learn how to use each major Dart language feature."
-has-permalinks: true
-js:
-- url: /js/lang-tour-analytics.js
-  defer: true
----
-
-<h1> {{ page.title }} </h1>
-
-<section class="overview">
-<p>
-Welcome to the Dart language tour!
-We'll show you how to use each major Dart language feature,
-from variables to operators to classes and libraries,
-with the assumption that you already know how to program in another language.
-</p>
-
-<aside>
-  <div class="alert alert-info">
-    <strong>Tip:</strong>
-    Create a server application project in Dart Editor
-    so you can play with each feature.
-    See <a href="/docs/editor/getting-started/">Getting Started with Dart Editor</a>
-    for instructions.
-  </div>
-</aside>
-
-<p>
-Consult the
-<a href="/docs/spec/index.html">Dart Language Specification</a>
-whenever you want more details about a language feature.
-</p>
-
-<h4 id="toc"> Contents </h4>
-<ol class="toc">
-  <li> <a href="#main-print">A basic Dart program</a> </li>
-  <li> <a href="#variables">Variables</a> </li>
-  <li> <a href="#built-in-types">Built-in types</a> </li>
-  <li> <a href="#functions">Functions</a> </li>
-  <li> <a href="#operators">Operators</a> </li>
-  <li> <a href="#control-flow">Control flow</a> </li>
-  <li> <a href="#exceptions">Exceptions</a> </li>
-  <li> <a href="#classes">Classes</a> </li>
-  <li> <a href="#interfaces">Interfaces</a> </li>
-  <li> <a href="#generics">Generics</a> </li>
-  <li> <a href="#libraries">Libraries and visibility</a> </li>
-  <li> <a href="#isolates">Isolates</a> </li>
-  <li> <a href="#typedefs">Typedefs</a> </li>
-  <li> <a href="#comments">Comments</a> </li>
-</ol>
-
-</section>
-
-
-{% comment %}
-NOTE: The guts of this page are in /_includes/language-tour/*/*.
-{% endcomment %}
-
-
-<section>
-  <h2 id="main-print"> A basic Dart program </h2>
-  {% render language-tour/1-main-print/index.markdown %}
-  <p class="up-to-toc">
-    <a href="#toc">Back to contents.</a>
-  </p>
-</section>
-
-<section>
-  <h2 id="variables"> Variables </h2>
-  {% render language-tour/2-variables/index.markdown %}
-  <p class="up-to-toc">
-    <a href="#toc">Back to contents.</a>
-  </p>
-</section>
-
-<section>
-  <h2 id="built-in-types"> Built-in types </h2>
-  {% include language-tour/3-built-in-types/index.html %}
-  <p class="up-to-toc">
-    <a href="#toc">Back to contents.</a>
-  </p>
-</section>
-
-<section>
-  <h2 id="functions"> Functions </h2>
-  {% render language-tour/functions/index.markdown %}
-  <p class="up-to-toc">
-    <a href="#toc">Back to contents.</a>
-  </p>
-</section>
-
-<section>
-  <h2 id="operators"> Operators </h2>
-  {% render language-tour/operators/index.markdown %}
-  <p class="up-to-toc">
-    <a href="#toc">Back to contents.</a>
-  </p>
-</section>
-
-<section>
-  <h2 id="control-flow"> Control flow </h2>
-  {% render language-tour/control-flow/index.markdown %}
-  <p class="up-to-toc">
-    <a href="#toc">Back to contents.</a>
-  </p>
-</section>
-
-<section>
-  <h2 id="exceptions">Exceptions</h2>
-  {% render language-tour/exceptions/index.markdown %}
-  <p class="up-to-toc">
-    <a href="#toc">Back to contents.</a>
-  </p>
-</section>
-
-<section>
-  <h2 id="classes">Classes</h2>
-  {% render language-tour/classes/index.markdown %}
-  <p class="up-to-toc">
-    <a href="#toc">Back to contents.</a>
-  </p>
-</section>
-
-<section>
-  <h2 id="interfaces">Interfaces</h2>
-  {% render language-tour/interfaces/index.markdown %}
-  <p class="up-to-toc">
-    <a href="#toc">Back to contents.</a>
-  </p>
-</section>
-
-<section>
-  <h2 id="generics">Generics</h2>
-  {% render language-tour/generics/index.markdown %}
-  <p class="up-to-toc">
-    <a href="#toc">Back to contents.</a>
-  </p>
-</section>
-
-<section>
-  <h2 id="libraries">Libraries and visibility</h2>
-  {% render language-tour/libraries/index.markdown %}
-  <p class="up-to-toc">
-    <a href="#toc">Back to contents.</a>
-  </p>
-</section>
-
-<section>
-  <h2 id="isolates">Isolates</h2>
-
-  <p>
-    All code in Dart runs in the context of an isolate.
-    You can use additional isolates for concurrent programming,
-    and to run third-party code more securely.
-  </p>
-
-  <p>
-    The isolates within an app don't share any state or memory.
-    Instead, isolates communicate by passing messages.
-    When an isolate sends a message,
-    the receiving isolate
-    gets a local copy of the original message's data.
-  </p>
-
-  <p>
-    Learn more about
-    <a href="/docs/library-tour/#dartisolate---concurrency-with-isolates">isolates</a> in the library tour.
-  </p>
-
-  <p class="up-to-toc">
-    <a href="#toc">Back to contents.</a>
-  </p>
-</section>
-
-<section>
-  <h2 id="typedefs">Typedefs</h2>
-  {% render language-tour/typedefs/index.markdown %}
-  <p class="up-to-toc">
-    <a href="#toc">Back to contents.</a>
-  </p>
-</section>
-
-<section>
-  <h2 id="comments">Comments</h2>
-  {% render language-tour/comments/index.markdown %}
-  <p class="up-to-toc">
-    <a href="#toc">Back to contents.</a>
-  </p>
-</section>