fix(docs): Add intersphinx_mapping

This fixes any documentation links to the enumerated projects.

Signed-off-by: Brian Harring <[email protected]>

Author: ferringb

doc/conf.py

@@ -324,3 +324,10 @@
 
 # If false, no index is generated.
 # epub_use_index = True
+
+intersphinx_mapping = {
+    "python": ("https://docs.python.org/3", None),
+}
+intersphinx_mapping.update(
+    (x, (f"https://pkgcore.github.io/{x}", None)) for x in "pkgcheck pkgcore snakeoil".split()
+)