[www] capitalize the headers in the prologue

www/index.html

@@ -44,7 +44,7 @@
                 </ul>
             </header>
             <section>
-                <h1>How to compile your language</h1>
+                <h1>How to Compile Your Language</h1>
 
                 <p>
                     This guide is intended to be a practical introduction to how
@@ -71,7 +71,7 @@ <h1>How to compile your language</h1>
                     compiled to a native executable with the introduction of
                     Kotlin/Native.
                 </p>
-                <h2>What does every language have in common?</h2>
+                <h2>What Does Every Language Have in Common?</h2>
                 <p>
                     When creating a new language, the first question is how to
                     get started. There is something that every existing language
@@ -97,7 +97,7 @@ <h2>What does every language have in common?</h2>
                     confusion for developers who try to get familiar with this
                     new language, which is something to keep in mind.
                 </p>
-                <h2>How is this text turned into an executable?</h2>
+                <h2>How Is This Text Turned into an Executable?</h2>
                 <p>
                     Indeed, so far the <code>main()</code> function is just a
                     few words of text stored in a file. A compiler usually
@@ -126,7 +126,7 @@ <h2>How is this text turned into an executable?</h2>
                     different steps than stack-based targets like
                     <code>WebAssembly</code> or <code>JVM Bytecode</code>.
                 </p>
-                <h2>Is it possible to learn all these topics?</h2>
+                <h2>Is It Possible to Learn All These Topics?</h2>
                 <p>
                     Yes, with enough time. However there is no need to learn all
                     of them to create a successful language. In fact even a lot