Update links to HTTPS and current 301 redirects in docs/templates/themes (#2661)

This also updates the Tumblr API to use HTTPS as documented in the
current Tumblr API docs.

pelican/tools/pelican_import.py

@@ -437,7 +437,7 @@ def tumblr2fields(api_key, blogname):
     import urllib.request as urllib_request
 
     def get_tumblr_posts(api_key, blogname, offset=0):
-        url = ("http://api.tumblr.com/v2/blog/%s.tumblr.com/"
+        url = ("https://api.tumblr.com/v2/blog/%s.tumblr.com/"
                "posts?api_key=%s&offset=%d&filter=raw") % (
             blogname, api_key, offset)
         request = urllib_request.Request(url)
@@ -607,7 +607,7 @@ def get_out_filename(output_path, filename, ext, kind,
     filename = os.path.basename(filename)
 
     # Enforce filename restrictions for various filesystems at once; see
-    # http://en.wikipedia.org/wiki/Filename#Reserved_characters_and_words
+    # https://en.wikipedia.org/wiki/Filename#Reserved_characters_and_words
     # we do not need to filter words because an extension will be appended
     filename = re.sub(r'[<>:"/\\|?*^% ]', '-', filename)  # invalid chars
     filename = filename.lstrip('.')  # should not start with a dot

pelican/tools/pelican_quickstart.py

@@ -70,7 +70,7 @@ CONF = {
 }
 
 # url for list of valid timezones
-_TZ_URL = 'http://en.wikipedia.org/wiki/List_of_tz_database_time_zones'
+_TZ_URL = 'https://en.wikipedia.org/wiki/List_of_tz_database_time_zones'
 
 
 # Create a 'marked' default path, to determine if someone has supplied

pelican/tools/templates/pelicanconf.py.jinja2

@@ -19,9 +19,9 @@ AUTHOR_FEED_ATOM = None
 AUTHOR_FEED_RSS = None
 
 # Blogroll
-LINKS = (('Pelican', 'http://getpelican.com/'),
-         ('Python.org', 'http://python.org/'),
-         ('Jinja2', 'http://jinja.pocoo.org/'),
+LINKS = (('Pelican', 'https://getpelican.com/'),
+         ('Python.org', 'https://www.python.org/'),
+         ('Jinja2', 'https://palletsprojects.com/p/jinja/'),
          ('You can modify those links in your config file', '#'),)
 
 # Social widget