fix(web): download buttons link directly to the installer asset (#35)

The CTAs pointed at the releases page; point them at the latest release
asset (Vitreous-Setup-0.1.0.exe) so a click downloads the installer
directly. GitHub serves release assets with a download disposition.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

Author: subhasisbiswal012

site/index.html

@@ -195,7 +195,7 @@
           <h1>Block the noise.<br><span class="glow">Lock</span> in the focus.</h1>
           <p class="lede">A free, local-first focus blocker for Windows. Block distracting sites on demand or on a schedule — then lock it so you can't undo it in a weak moment.</p>
           <div class="cta-row">
-            <a class="btn btn-pri" href="#download">▼ Download for Windows</a>
+            <a class="btn btn-pri" href="https://github.com/subhasisbiswal012/Vitreous/releases/latest/download/Vitreous-Setup-0.1.0.exe" download>▼ Download for Windows</a>
             <a class="btn btn-ghost" href="https://github.com/subhasisbiswal012/Vitreous">View source</a>
           </div>
           <div class="meta"><b>v0.1.0</b> · Windows 10/11 · Free &amp; open source · No account</div>
@@ -280,8 +280,8 @@ <h2>Three steps to a quieter screen.</h2>
         <h2>Get Vitreous.</h2>
         <p class="mono">Free forever · open source · Windows 10/11 · ~92 MB</p>
         <div class="cta-row" style="justify-content:center">
-          <a class="btn btn-pri" href="https://github.com/subhasisbiswal012/Vitreous/releases/latest">▼ Download v0.1.0 for Windows</a>
-          <a class="btn btn-ghost" href="https://github.com/subhasisbiswal012/Vitreous">Releases &amp; source</a>
+          <a class="btn btn-pri" href="https://github.com/subhasisbiswal012/Vitreous/releases/latest/download/Vitreous-Setup-0.1.0.exe" download>▼ Download v0.1.0 for Windows</a>
+          <a class="btn btn-ghost" href="https://github.com/subhasisbiswal012/Vitreous/releases/latest">Releases &amp; source</a>
         </div>
         <div class="meta">Unsigned for now — SmartScreen may warn; choose <b>More info → Run anyway</b>.</div>
       </div>