add account edit (settings) routes

* Added account_url filter to jinja2 environment. This produces a path
  to the user's account url (/account/{username}).
* Updated archdev-navbar to link to new edit route.
+ Added migrate_cookies(request, response) to aurweb.util, a function
  that simply migrates the request cookies to response and returns it.
+ Added account_edit tests to test_accounts_routes.py.

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

aurweb/util.py

@@ -82,6 +82,12 @@ def valid_ssh_pubkey(pk):
     return base64.b64encode(base64.b64decode(tokens[1])).decode() == tokens[1]
 
 
+def migrate_cookies(request, response):
+    for k, v in request.cookies.items():
+        response.set_cookie(k, v)
+    return response
+
+
 @jinja2.contextfilter
 def account_url(context, user):
     request = context.get("request")