[del] remove searx_engine - no use case (#6680)

There is no meaningful use-case for the engine, moreover the implementation
is 10 years old (formerly searx) and no longer fits the current data model of
SearXNG.

Closes: - https://github.com/searxng/searxng/issues/6676

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/engines/searx_engine.py

@@ -1,57 +0,0 @@
-# SPDX-License-Identifier: AGPL-3.0-or-later
-"""
-Searx (all)
-"""
-
-from json import loads
-from searx.engines import categories as searx_categories
-
-# about
-about = {
-    "website": 'https://github.com/searxng/searxng',
-    "wikidata_id": 'Q17639196',
-    "official_api_documentation": 'https://docs.searxng.org/dev/search_api.html',
-    "use_official_api": True,
-    "require_api_key": False,
-    "results": 'JSON',
-}
-
-categories = searx_categories.keys()
-
-# search-url
-instance_urls = []
-instance_index = 0
-
-
-# do search-request
-def request(query, params):
-    global instance_index  # pylint: disable=global-statement
-    params['url'] = instance_urls[instance_index % len(instance_urls)]
-    params['method'] = 'POST'
-
-    instance_index += 1
-
-    params['data'] = {
-        'q': query,
-        'pageno': params['pageno'],
-        'language': params['language'],
-        'time_range': params['time_range'],
-        'category': params['category'],
-        'format': 'json',
-    }
-
-    return params
-
-
-# get response from search-request
-def response(resp):
-
-    response_json = loads(resp.text)
-    results = response_json['results']
-
-    for i in ('answers', 'infoboxes'):
-        results.extend(response_json[i])
-
-    results.extend({'suggestion': s} for s in response_json['suggestions'])
-
-    return results

searx/settings.yml

@@ -2296,14 +2296,6 @@ engines:
     shortcut: pwv
     disabled: true
 
-  # - name: searx
-  #   engine: searx_engine
-  #   shortcut: se
-  #   instance_urls :
-  #       - http://127.0.0.1:8888/
-  #       - ...
-  #   disabled: true
-
   - name: seekninja
     engine: seekninja
     shortcut: sen