feat: add paging to package depends & required by

This patch does not include a javascript implementating, but
provides a pure HTML/HTTP method of paging through these lists.

Also fixes erroneous limiting. We now use a hardcoded limit of 20
by default.

Signed-off-by: Kevin Morris <kevr@0cost.org>

aurweb/templates.py

@@ -100,6 +100,8 @@ async def make_variable_context(request: Request, title: str, next: str = None):
     for k, v in to_copy.items():
         context[k] = v
 
+    context["q"] = dict(request.query_params)
+
     return context