Refactor layout and button styles

* Add single-column layout for forms
* Add optional nav/buttons to section headers

app/templates/contributions/new.hbs

@@ -1,10 +1,13 @@
-<section id="add-contribution">
-  <header>
-    <h2>Submit a contribution</h2>
-  </header>
+<main class="center-column">
 
-  <div class="content">
-    {{add-contribution contributors=sortedContributors save=(action "save")}}
-  </div>
-</section>
+  <section id="add-contribution">
+    <header>
+      <h2>Submit a contribution</h2>
+    </header>
 
+    <div class="content">
+      {{add-contribution contributors=sortedContributors save=(action "save")}}
+    </div>
+  </section>
+
+</main>

app/templates/index.hbs

@@ -33,8 +33,13 @@
   <div id="contributions">
     {{#if contributionsUnconfirmed}}
       <section id="contributions-unconfirmed">
-        <header>
+        <header class="with-nav">
           <h2>Latest Contributions</h2>
+          {{#if kredits.hasAccounts}}
+            <nav>
+              {{link-to "add" "contributions.new" title="Submit a contribution" class="button small green"}}
+            </nav>
+          {{/if}}
         </header>
         <div class="content">
           {{!-- TODO: We need a better naming for kredits.hasAccounts --}}
@@ -53,13 +58,6 @@
         {{contribution-list contributions=contributionsConfirmedSorted
                             vetoContribution=(action "vetoContribution")}}
       </div>
-
-      {{!-- TODO: We need a better naming --}}
-      {{#if kredits.hasAccounts}}
-        <p class="actions">
-          {{#link-to "proposals.new"}}Create new proposal{{/link-to}}
-        </p>
-      {{/if}}
     </section>
   </div>