Publish Vulpes Preview 15 sources for desktop, Android and Tundra

Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.

gaia/apps/settings/elements/search.html

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+<element name="search" extends="section">
+  <template>
+
+    <gaia-header action="back" data-href="#root">
+      <h1 data-l10n-id="search-header"></h1>
+    </gaia-header>
+
+    <div>
+      <ul>
+        <li>
+          <p data-l10n-id="search-engine"></p>
+          <div class="button icon icon-dialog">
+            <select name="search.provider">
+            </select>
+          </div>
+        </li>
+        <li>
+          <gaia-switch name="search.suggestions.enabled">
+            <label data-l10n-id="search-suggestions"></label>
+          </gaia-switch>
+        </li>
+        <li class="description">
+          <p data-l10n-id="search-suggestions-description"></p>
+        </li>
+      </ul>
+    </div>
+
+    <panel data-path="panels/search/panel"></panel>
+
+  </template>
+</element>