release: 0.6.0: Delivery detail page, DNS badge, machine metrics, wide layout

A page per delivery (`/deliveries/{id}`), reached from the *Details* link on
Added:
  - A page per delivery (`/deliveries/{id}`), reached from the *Details* link on
  - A **DNS** badge in the domain list, one per row, carrying the same
  - Machine metrics on the status page: a **Machine** card reporting the
  - An index of the current page's own sections in the navigation column, for the
Changed:
  - Every panel page is laid out in one column of the same width, so moving
  - The mark's small-size variant — the tab icon and the `SP` initials it
  - The stamp's `SELF-HOSTED SMTP RELAY` line is set at 11.5/0.15 instead of
  - The delivery log lists what identifies a message and nothing else: time,
  - Subjects are decoded for display as well as on the way in, so the rows the
  … (4 more in CHANGELOG)

Full detail: CHANGELOG.md (0.6.0).

internal/web/templates/backup.html

@@ -28,16 +28,10 @@
   {{if .ImportErr}}<p class="error">{{.ImportErr}}</p>{{end}}
   <form method="post" action="/domains/import" enctype="multipart/form-data">
     <label for="importfile">Domain export file</label>
-    <input id="importfile" name="file" type="file" accept=".json,.spde,application/json" required>
-    <div class="encrypt">
-      <label class="check">
-        <input type="checkbox" data-encrypt-toggle>
-        <span>The file is encrypted (<code>.spde</code>)</span>
-      </label>
-      <div class="encrypt-fields" data-encrypt-fields>
-        <label for="importpw">Password</label>
-        <input id="importpw" name="import_password" type="password" autocomplete="off">
-      </div>
+    <input id="importfile" name="file" type="file" accept=".json,.spde,application/json" required data-import-file>
+    <div class="encrypt-fields" data-import-password-fields>
+      <label for="importpw">Password</label>
+      <input id="importpw" name="import_password" type="password" autocomplete="off">
     </div>
     <button type="submit">Import domain</button>
   </form>