[mod] isolation of botdetection from the limiter

This patch was inspired by the discussion around PR-2882 [2].  The goals of this
patch are:

1. Convert plugin searx.plugin.limiter to normal code [1]
2. isolation of botdetection from the limiter [2]
3. searx/{tools => botdetection}/config.py and drop searx.tools
4. in URL /config, 'limiter.enabled' is true only if the limiter is really
   enabled (Redis is available).

This patch moves all the code that belongs to botdetection into namespace
searx.botdetection and code that belongs to limiter is placed in namespace
searx.limiter.

Tthe limiter used to be a plugin at some point botdetection was added, it was
not a plugin.  The modularization of these two components was long overdue.
With the clear modularization, the documentation could then also be organized
according to the architecture.

[1] https://github.com/searxng/searxng/pull/2882
[2] https://github.com/searxng/searxng/pull/2882#issuecomment-1741716891

To test:

- check the app works without the limiter, check `/config`
- check the app works with the limiter and with the token, check `/config`
- make docs.live .. and read
  - http://0.0.0.0:8000/admin/searx.limiter.html
  - http://0.0.0.0:8000/src/searx.botdetection.html#botdetection

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

searx/botdetection/ip_limit.py

@@ -13,8 +13,7 @@ and at least for a maximum of 10 minutes.
 
 The :py:obj:`.link_token` method can be used to investigate whether a request is
 *suspicious*.  To activate the :py:obj:`.link_token` method in the
-:py:obj:`.ip_limit` method add the following to your
-``/etc/searxng/limiter.toml``:
+:py:obj:`.ip_limit` method add the following configuration:
 
 .. code:: toml
 
@@ -46,13 +45,13 @@ from ipaddress import (
 
 import flask
 import werkzeug
-from searx.tools import config
 from searx import settings
 
 from searx import redisdb
 from searx.redislib import incr_sliding_window, drop_counter
 
 from . import link_token
+from . import config
 from ._helpers import (
     too_many_requests,
     logger,