Show less buttons and more links

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

src/index.html

@@ -21,26 +21,23 @@ documentation_list:
     image_caption: "Image courtesy of [Unsplash](https://unsplash.com/)"
     alt: "overview"
     title: "Overview"
-    excerpt: "A one-page summary explains the unique properties of this system."
-    url: "https://tahoe-lafs.readthedocs.io/en/latest/about-tahoe.html"
-    btn_label: "Read More"
-    btn_class: "btn--primary"
+    excerpt: "A [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/)"
     alt: "manual"
     title: "Manual"
-    excerpt: "User manual with installation instructions and configuration guides."
-    url: "https://tahoe-lafs.readthedocs.io/"
-    btn_label: "Read More"
-    btn_class: "btn--primary"
+    excerpt: "
+      * [Installation Instructions](https://tahoe-lafs.readthedocs.io/en/latest/Installation/install-tahoe.html)
+      * [Tahoe-LAFS Manual](http://tahoe-lafs.readthedocs.org/) (tahoe-lafs.readthedocs.org)
+    "
   - image_path: /assets/images/wiki.jpg
     image_caption: "Image courtesy of [Unsplash](https://unsplash.com/)"
     alt: "wiki"
     title: "Wiki"
-    excerpt: "FAQ and other Wiki pages.<br/><br/>"
-    url: "https://tahoe-lafs.org/trac/tahoe-lafs/wiki/FAQ"
-    btn_label: "Read More"
-    btn_class: "btn--primary"
+    excerpt: "
+      * [Index of docs](https://tahoe-lafs.org/trac/tahoe-lafs/wiki/Doc)
+      * [Frequently Asked Questions](https://tahoe-lafs.org/trac/tahoe-lafs/wiki/FAQ)
+    "
 contribute:
   - title: "Get Involved"
     excerpt: ""