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/templates.py

@@ -12,7 +12,7 @@ from fastapi.responses import HTMLResponse
 
 import aurweb.config
 
-from aurweb import captcha, l10n, time
+from aurweb import captcha, l10n, time, util
 
 # Prepare jinja2 objects.
 loader = jinja2.FileSystemLoader(os.path.join(
@@ -27,6 +27,9 @@ env.filters["tr"] = l10n.tr
 env.filters["captcha_salt"] = captcha.captcha_salt_filter
 env.filters["captcha_cmdline"] = captcha.captcha_cmdline_filter
 
+# Add account utility filters.
+env.filters["account_url"] = util.account_url
+
 
 def make_context(request: Request, title: str, next: str = None):
     """ Create a context for a jinja2 TemplateResponse. """