add Search URL section to /user/site-settings.html template.

This is just the front-end for this feature. The back-end has not been
implemented at the time of this commit.

templates/user/site-settings.html

@@ -54,6 +54,36 @@
 
     <hr>
 
+    <h2>Search URL</h2>
+    <form class="be-gui-form"
+	  action="/site-settings/update-search-url"
+	  method="post">
+	<input required
+	       type="hidden"
+	       name="AUTHENTICITY-TOKEN"
+	       value="{{token}}">
+        <p class="be-gui-form-hint">
+	    This is the URL for the search service used by this
+	    website. The default URL is <em>http://localhost:7700</em>. You
+	    would normally use that when on running this website on your
+	    local dev. machine.
+        </p>
+        <div class="be-gui-form-row">
+	    <input required
+	           type="text"
+	           name="SEARCH-URL's"
+	           value="{{settings.search-url}}">
+	    <button class="be-gui-button-no-text"
+		    title="Click to update Search URL"
+		    type="submit">
+	        <img alt="Update site's Search URL"
+		     src="/images/icons/save.png">
+	    </button>
+        </div>
+    </form>
+
+    <hr>
+
     <h2>Home Page</h2>
     <p class="be-gui-form-hint">
 	Only 'Pages' can be used for the Home page. 'Archive Entries'
@@ -199,8 +229,8 @@
 	{% endfor %}
         <br>
         <button class="be-gui-button"
-		       title="Click to update Navigation Menu"
-		       type="submit">
+		title="Click to update Navigation Menu"
+		type="submit">
 	    <img alt="Update Navigation Menu"
 		 src="/images/icons/save.png">
             Update Navigation Menu
@@ -260,8 +290,8 @@
                   name="CODE-SNIPPET">{{site-wide-snippet}}
         </textarea>
         <button class="be-gui-button"
-		       title="Click to save 'Enable Sign-Up' setting"
-		       type="submit">
+		title="Click to save 'Enable Sign-Up' setting"
+		type="submit">
 	    <img alt="Save nav. menu setting for{{db-data.title}}"
 		 src="/images/icons/save.png">
             Save Snippet