[doc] fix rst format to be able to upload the package to pypi

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With Docker

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Go to the `searx-docker <https://github.com/searx/searx-docker>`__ project.

Without Docker

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For all of the details, follow this `step by step installation <https://asciimoo.github.io/searx/dev/install/installation.html>`__.

Note: the documentation needs to be updated.

If you are in a hurry

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-  clone the source:

   ``git clone https://github.com/asciimoo/searx.git && cd searx``

-  install dependencies: ``./manage.sh update_packages``