fix: replace regex with path match for secondary links (#94)

When I upgraded to Flask V2, I didn't realize that the `regex` matcher
seems to be gone, and now this is the only set of matchers that exist:

<img width="837" alt="image"
src="https://github.com/user-attachments/assets/596700fc-f17d-46b6-9885-f32b51067be7">

Replacing the regex matcher with `path` seems to work though:

```
% curl localhost/git/fooobar -v 2>&1 | grep Location
< Location: https://github.com/Nextdoor/fooobar
% curl localhost/git -v 2>&1 | grep Location 
< Location: https://github.com/Nextdoor
```

Co-authored-by: Matt Wise <diranged@users.noreply.github.com>

src/app.py

@@ -53,7 +53,7 @@ def __init__(self, url_map, *items):
 )
 app.add_url_rule("/_edit", view_func=gogo.EditShortcutView.as_view("edit_shortcut"))
 app.add_url_rule(
-    '/<regex(".+"):name>',
+    '/<path:name>',
     view_func=gogo.ShortcutRedirectView.as_view("shortcut_redirect"),
 )