Dramatically improve AMP support, adding all the missing fields so that the AMP version still parses to a reasonable h-entry

lemoncurry/templatetags/absolute_url.py

@@ -0,0 +1,10 @@
+from django import template
+from urllib.parse import urljoin
+from ..utils import origin
+
+register = template.Library()
+
+
+@register.simple_tag(takes_context=True)
+def absolute_url(context, url):
+    return urljoin(origin(context.request), url)