[fix] use base_url everywhere if it is defined in settings.yml

from time import time

from html import escape

from io import StringIO

from urllib.parse import urlencode, urlparse, urljoin

from urllib.parse import urlencode, urlparse, urljoin, urlsplit

from pygments import highlight

from pygments.lexers import get_lexer_by_name

        filename_with_theme = "themes/{}/{}".format(theme_name, values['filename'])

        if filename_with_theme in static_files:

            values['filename'] = filename_with_theme

    return url_for(endpoint, **values)

    url = url_for(endpoint, **values)

    if settings['server']['base_url']:

        if url.startswith('/'):

            url = url[1:]

        url = urljoin(settings['server']['base_url'], url)

    return url

def proxify(url):