Manifest fixes

2012/omoikane had some updates but the manifest was not properly updated
(so it would seem - it seems right but I cannot figure out how it was
not as obviously the CSV file was correct).

For some reason 2020/yang/index.html navigation linked to 2024/anders
which of course is a 404 (I seem to recall a mix-up that was fixed but
the html files were not rebuilt).

The 2020/yang/.entry.json file had the wrong manifest version as well.

2020/yang/.entry.json

@@ -1,6 +1,6 @@
 {
     "no_comment" : "mandatory comment: because comments were removed from the original JSON spec",
-    "entry_JSON_format_version" : "1.1 2024-02-11",
+    "entry_JSON_format_version" : "1.2 2024-09-25",
     "award" : "Best abuse of CPP",
     "year" : 2020,
     "dir" : "yang",