miniflux: fix link to docs

Changed files
+1 -1
nixos
modules
services
web-apps
+1 -1
nixos/modules/services/web-apps/miniflux.nix
···
'';
description = ''
Configuration for Miniflux, refer to
-
<link xlink:href="http://docs.miniflux.app/en/latest/configuration.html"/>
+
<link xlink:href="https://miniflux.app/docs/configuration.html"/>
for documentation on the supported values.
'';
};