Add iframe-able search page for insertion into other sites

Introduces a new html template, search.html, which provides a very basic
form for submitting search queries.

Closes #319

app/routes.py

@@ -159,6 +159,14 @@ def opensearch():
     ), 200, {'Content-Disposition': 'attachment; filename="opensearch.xml"'}
 
 
+@app.route('/search.html', methods=['GET'])
+def search_html():
+    search_url = g.app_location
+    if search_url.endswith('/'):
+        search_url = search_url[:-1]
+    return render_template('search.html', url=search_url)
+
+
 @app.route('/autocomplete', methods=['GET', 'POST'])
 def autocomplete():
     q = g.request_params.get('q')

app/templates/search.html

@@ -0,0 +1,13 @@
+<form id="search-form" action="{{ url }}/search" method="post">
+    <input
+            type="text"
+            name="q"
+            style="width: 90%;"
+            autofocus="autofocus"
+            autocapitalize="none"
+            spellcheck="false"
+            autocorrect="off"
+            placeholder="Whoogle Search"
+            autocomplete="off">
+    <input type="submit" style="width: 9%" id="search-submit" value="Search">
+</form>