Enable atom feed generation

Only doing simple all-articles to keep it simple and since we only have
a quite small number of posts

Close #39

pelicanconf.py

@@ -4,7 +4,7 @@
 
 AUTHOR = 'janepie'
 SITENAME = 'chaos.jetzt'
-SITEURL = ''
+SITEURL = 'https://chaos.jetzt'
 SITENAME = 'chaos.jetzt'
 SITETITLE = 'chaos.jetzt'
 SITESUBTITLE = 'Wir sind junge Menschen im Chaos-Umfeld - komm und mach mit!'
@@ -34,7 +34,7 @@
 LOCALE = 'de_DE'
 
 # Feed generation is usually not desired when developing
-FEED_ALL_ATOM = None
+FEED_ALL_ATOM = "feeds/all.atom.xml"
 CATEGORY_FEED_ATOM = None
 TRANSLATION_FEED_ATOM = None
 AUTHOR_FEED_ATOM = None