Use '+' as the substitution for '/' rather than '%2F' since nginx seems to want to normalize the %2F back into / which would defeat the purpose.

epilogue/archive_generator.py

@@ -26,6 +26,10 @@ class ArchiveLinker(Linker):
     def __init__ (self, directory_names=[]):
         super().__init__()
         self.directory_names = directory_names
+        self.replacements = {
+            "/": "+",
+            #":": ""
+        }
 
     def translate_page_title (self, page_title):
         page_title = super().translate_page_title(page_title)
@@ -37,7 +41,10 @@ class ArchiveLinker(Linker):
                 page_title = page_title[len(directory_name) + 1:]
                 break
 
-        return f"{directory_name}{'/' if directory_name else ''}{page_title.replace('/', '%2F')}.html"
+        for key, value in self.replacements.items():
+            page_title = page_title.replace(key, value)
+
+        return f"{directory_name}{'/' if directory_name else ''}{page_title}.html"
 
 def prepare_thread (thread):
     thread.subject = html.unescape(thread.subject)