Add workflows option definition

Bug: twpowertools:74

Change-Id: I923966a40493496ecc006e0c2fcde2ecf823b807
diff --git a/src/static/options/experiments.html b/src/static/options/experiments.html
index 0f42f11..83a58cb 100644
--- a/src/static/options/experiments.html
+++ b/src/static/options/experiments.html
@@ -13,6 +13,7 @@
       <p data-i18n="experiments_description"></p>
       <form>
         <div id="optional-permissions-warning" hidden data-i18n="optionalpermissionswarning_header"></div>
+        <div class="option"><input type="checkbox" id="workflows"> <label for="workflows" data-i18n="workflows"></label> <button id="manage-workflows" data-i18n="workflows_manage"></button></div>
         <div class="actions"><button id="save" data-i18n="save"></button></div>
       </form>
       <div id="save-indicator"></div>