[mod] configuration to overwrite engine description

Engine description can be configured, this is needed e.g. by custom search
engines.  Here is an example of a command engine with a description in the about
section::

    - name: locate
      engine: command
      command: ['locate', '{{QUERY}}']
      disabled: true
      categories: files
      about:
        description: local files
        website: 'https://www.man7.org/linux/man-pages/man1/locate.1.html'
      delimiter:
          chars: ' '
          keys: ['line']

Closes: https://github.com/searxng/searxng/issues/788
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

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