Remove whitespace caused by Jinja commands

Adding this conf change will remove every newline created by a Jinja command (`{% %}`). It can save a bit of bandwidth.

searx/webapp.py

@@ -81,6 +81,8 @@ app = Flask(
     template_folder=templates_path
 )
 
+app.jinja_env.trim_blocks = True
+app.jinja_env.lstrip_blocks = True
 app.secret_key = settings['server']['secret_key']
 
 babel = Babel(app)