Toward the minimal mockup

Signed-off-by: Benoit Donneaux <benoit@leastauthority.com>

src/index.html

@@ -3,37 +3,32 @@ title: "Welcome <i>The</i> Least-Authority File Store"
 layout: splash
 author_profile: false
 header:
-  overlay_color: "#000"
-  overlay_filter: "0.4"
-  overlay_image: /assets/images/overlay.jpg
+  overlay_color: "#ccc"
   actions:
     - label: "Download"
       url: "https://tahoe-lafs.org/downloads"
-  caption: "Photo credit: [**Unsplash**](https://unsplash.com)"
-excerpt: "Tahoe-LAFS is a Free and Open decentralized cloud storage system.
+excerpt: >-
+  Tahoe-LAFS is a Free and Open decentralized cloud storage system.
   It distributes your data across multiple servers.<br/>
   Even if some of the servers fail or are taken over by an attacker,
-  the entire file store continues to function correctly, preserving your privacy and security."
+  the entire file store continues to function correctly, preserving your privacy and security.
 documentation:
   - title: "Read Some Nice Docs"
 documentation_list:
-  - image_path: /assets/images/overview.jpg
-    image_caption: "Image courtesy of [Unsplash](https://unsplash.com/)"
+  - image_path: /assets/images/overview.png
     alt: "overview"
     title: "Overview"
     excerpt: '
       This [one-page summary](https://tahoe-lafs.readthedocs.io/en/latest/about-tahoe.html) explains the unique properties of this system
     '
-  - image_path: /assets/images/manual.jpg
-    image_caption: "Image courtesy of [Unsplash](https://unsplash.com/)"
+  - image_path: /assets/images/manual.png
     alt: "manual"
     title: "Manual"
     excerpt: '<ul>
       <li><a href="https://tahoe-lafs.readthedocs.io/en/latest/Installation/install-tahoe.html">Installation Instructions</a></li>
       <li><a href="http://tahoe-lafs.readthedocs.org/">Tahoe-LAFS Manual</a></li>
     </ul>'
-  - image_path: /assets/images/wiki.jpg
-    image_caption: "Image courtesy of [Unsplash](https://unsplash.com/)"
+  - image_path: /assets/images/wiki.png
     alt: "wiki"
     title: "Wiki"
     excerpt: '<ul>
@@ -44,8 +39,7 @@ contribute:
   - title: "Get Involved"
     excerpt: ""
 contribute_list:
-  - image_path: /assets/images/messaging.jpg
-    image_caption: "Image courtesy of [Unsplash](https://unsplash.com/)"
+  - image_path: /assets/images/discussions.png
     alt: "discussions"
     title: "Discussions"
     excerpt: '<ul>
@@ -56,16 +50,14 @@ contribute_list:
         <li>First of the month for project governance</li>
         <li>Others for technical discussions</li>
     </ul>'
-  - image_path: /assets/images/tickets.jpg
-    image_caption: "Image courtesy of [Unsplash](https://unsplash.com/)"
+  - image_path: /assets/images/issues.png
     alt: "issues"
     title: "Issues"
     excerpt: '<ul>
       <li>Visit the <a href="https://code.lafs.eval.latfa.net/tahoe-lafs/trac/issues"><b>issue</b></a> tracker</li>
       <li>Register an <a href="https://code.lafs.eval.latfa.net/user/sign_up"><b>account</b></a> to interact</li>
     </ul>'
-  - image_path: /assets/images/code.jpg
-    image_caption: "Image courtesy of [Unsplash](https://unsplash.com/)"
+  - image_path: /assets/images/code.png
     alt: "code"
     title: "Code"
     excerpt: '<ul>