[fix] url

.. _searx.space: https://searx.space

.. _user: https://docs.searxng.org/user

.. _admin: https://docs.searxng.org/user/admin

.. _admin: https://docs.searxng.org/admin

.. _developer: https://docs.searxng.org/dev

.. _homepage: https://docs.searxng.org/

.. _metasearch engine: https://en.wikipedia.org/wiki/Metasearch_engine