Mostly fixed the packages list, grid and detail views

app/views/packages/_grid_thumbnail.slim

@@ -0,0 +1,15 @@
+// TODO: Handle packages with multiple screenshots
+a.black href=package_path(name: pkg.name)
+  div.grid-thumbnail
+    - if pkg.screenshots.any?
+      img src=pkg.screenshots[0].url('small')
+    - else
+      // TODO: make it a link to /upload
+      a href=upload_package_path(name: pkg.name)
+        img.screenshot src="/images/dummy/no-screenshots-upload-one.svg"
+  div
+    // TODO: use description instead of package name (as soon as it is available)
+    .pkgname
+      =pkg.name
+    .pkgdescription
+      = pkg.description