WIP Details pane + contributor profiles

Adds a 3-pane layout option for showing details, as well as a dashboard
sub-route for showing contributor details in the new details pane.

app/components/contributor-list/template.hbs

@@ -1,6 +1,6 @@
 <tbody>
   {{#each contributorList as |c|}}
-    <tr role="button" class={{if (is-current-user c.contributor) "current-user"}} {{action "toggleContributorInfo" c}}>
+    <tr role="button" class={{if (is-current-user c.contributor) "current-user"}} {{action "openContributorDetails" c.contributor}}>
       <td class="person">
         {{user-avatar contributor=c.contributor}} {{c.contributor.name}}
       </td>
@@ -15,25 +15,5 @@
         <span class="symbol">₭S</span>
       </td>
     </tr>
-    <tr class="metadata {{if (is-current-user c.contributor) "current-user"}} {{if c.showMetadata "visible"}}">
-      <td colspan="2">
-        <ul>
-          <li>
-            <a href="https://rinkeby.etherscan.io/address/{{c.contributor.account}}" target="_blank" rel="noopener">Inspect Ethereum transactions</a>
-          </li>
-          {{#if c.contributor.ipfsHash}}
-            <li>
-              <a href="https://ipfs.io/ipfs/{{c.contributor.ipfsHash}}" target="_blank" rel="noopener">Inspect IPFS profile</a>
-            </li>
-          {{/if}}
-          <li>
-            {{link-to "Edit profile" "contributors.edit" c.contributor.id}}
-          </li>
-        </ul>
-        {{#if c.showMetadata}}
-          <pre>{{c.contributor.ipfsData}}</pre>
-        {{/if}}
-      </td>
-    </tr>
   {{/each}}
 </tbody>